I represent States and private and State-owned entities in high-stakes international arbitrations and public international law matters.

Christina Hioureas is a partner and Chair of the firm’s United Nations practice group, and member of the firm’s Management Committee.

Christina represents States, State-owned entities, and corporations in international commercial and investment treaty disputes and public international law matters—including before all major arbitral fora (ICSID, UNCITRAL/ PCA, ICC, SIAC, LCIA, ICDR, AAA, HKIAC), the International Court of Justice (ICJ), and the International Tribunal for the Law of the Sea (ITLOS). She has also served as presiding, sole, emergency and co-arbitrator in nearly 80 international arbitrations. Described as a “dominant force in the international arbitration community,” a "formidable advocate" and "a skilled investigator, case strategist, and disciplined team leader," Hioureas has been recognized in Chambers & Partners - Global and USA in the areas of Arbitration Counsel, Arbitrators, and Public International Law, respectively (2020-present). With respect to her work as arbitrator, Chambers & Partners – USA: Arbitrators (2025) notes: "Christina's work as an arbitrator is outstanding. She prepares for each hearing thoroughly and is a balanced and efficient arbitrator."

As head of the United Nations Practice Group, Christina advises States, organizations, and private entities on matters before the United Nations and its bodies, including the UN General Assembly and the Security Council. As a Lecturer-in-Law at Columbia Law School (New York) and the USC Gould School of Law (Los Angeles) Christina teaches courses on the intersection between international arbitration and public international law.

Christina was recognized as one of the "Top 10 Most Innovative Lawyers—North America" (2024) by the Financial Times. She has three times been awarded the Center for Justice and Accountability’s "Partners in Justice" award for her work on transitional justice in Somalia, Cambodia, and Chile.

Her experience includes:

As presiding, sole, emergency, and co-arbitrator in disputes under UNCITRAL, ICC, LCIA, SIAC, HKIAC, ICDR, and AAA Rules relating to construction, natural gas, renewables, hospitality, franchise, supply chain, pharmaceuticals, fashion, technology, civil rights, cryptocurrency, and cyber-security, with amounts at stake upwards of $650 million. She is also a CEDR-certified mediator.
As counsel in investment treaty and commercial arbitrations relating to cleantech, gas pricing/re-opener, energy supply, banking, construction, hospitality, taxation, and shareholder matters, under investment treaties and foreign investment laws; joint venture agreements; EPC contracts; sale and purchase agreements; production sharing contracts; power purchase agreements; joint development agreements; offtake agreements; and long-term leases, with amounts at stake upwards of $10 billion. Her extensive counsel experience encompasses representation of both private investors as well as sovereign States and State-owned entities, providing her with an understanding of the legal and commercial perspectives of all stakeholders in investment and commercial disputes.
As counsel to States before the United Nations, as well as the ICJ, ITLOS, and regional human rights tribunals on issues including decolonization, self-determination, jus cogens, international environmental law / climate change, sea level rise, human rights, international humanitarian law, law of occupation, and rendition.
As counsel before U.S. courts under the Alien Tort Statute and the Torture Victim Protection Act in cases alleging extrajudicial killing, torture, cruel treatment, arbitrary detention, and crimes against humanity; Foreign Sovereign Immunities Act in connection with embassies and consulates; and defense and enforcement of arbitral awards under the Federal Arbitration Act.

Related Industries

Sovereign States

Related Practices

Education

The Hague Academy of International Law, 2011
University of California Berkeley School of Law Boalt Hall, J.D., American Jurisprudence Award - International Law, 2007
University of California, Berkeley, B.A., highest honors, 2004

Bar and Court Admissions

BAR ADMISSIONS

New York
California
England and Wales

COURT ADMISSIONS

U.S. Supreme Court
U.S. Court of Appeals for the Second Circuit
U.S. Court of Appeals for the Ninth Circuit
U.S. Court of Appeals for the Eleventh Circuit
U.S. District Court for the Southern District of New York
U.S. District Court for the Northern District of California
United States Court of Appeals for the Second Circuit

Languages

Greek

Experience

International Investment Treaty Arbitration

Yaacov Afik, Michael Mistriel Aykout and Shimon Mistriel Aykout v. Republic of Cyprus. Counsel to Cyprus in ICSID arbitration under the Israel-Cyprus BIT concerning illegal land acquisitions in the occupied territory in northern Cyprus.
Chevron Bangladesh Block Twelve, Ltd. and Chevron Bangladesh Blocks Thirteen and Fourteen, Ltd. v. People’s Republic of Bangladesh and Bangladesh Oil Gas and Mineral Corporation. Counsel to Bangladesh State entities in ICSID arbitration.
Niko Resources Ltd. v. Bangladesh Oil Gas and Mineral Corporation and Bangladesh Petroleum Exploration and Production Company (Compensation Declaration). Counsel to Bangladesh State entities concerning the causes and impact of two natural gas well blowouts and the resulting health, environmental, and natural resource losses.
Bangladesh Oil Gas and Mineral Corporation and Bangladesh Petroleum Exploration and Production Company v. Niko Resources Ltd (Payment Claim). Counsel in annulment proceeding relating to, inter alia, corruption claims.
Niko Exploration (Block 9) Ltd. v. Bangladesh and Bangladesh Oil and Gas Mineral Corp. Counsel to Bangladeshi State-owned oil and gas company in a contract-based ICSID arbitration involving an investment procured through corruption.
Krisenergy v. Bangladesh and Petrobangla. Counsel to Bangladesh and Petrobangla in ICSID contractual arbitration arising from assessed taxes.
Raiffeisen Bank International AG and Raiffeisen Bank Austria d.d. v. Republic of Croatia. Counsel to Croatia in an UNCITRAL arbitration under the Croatia-Austria BIT arising from alleged investments in Croatia’s financial sector.
Adria Group B.V. and Adria Group Holding B.V. v. Republic of Croatia. Counsel to Croatia in an ICSID arbitration under the Croatia-Netherlands BIT arising from alleged investments in a retail enterprise in Croatia.
Patel Engineering Ltd. V. Republic of Mauritius. Counsel to Mauritius in an UNCITRAL arbitration administered by the PCA brought by an Indian investor relating to the commercial termination of a land development agreement.
Counsel to State. Analyzed potential investment claim in energy sector for State and developed strategy which deterred investor from filing arbitration claim.
Wuxi T. Hertz Technologies Co. Ltd. and Jetion Solar Co. Ltd. v. Hellenic Republic. Counsel to Greece in an UNCITRAL arbitration under the Greece–China BIT involving alleged investments in a photovoltaic project in Greece.
Baymina Enerji Anonim Şirketi v Boru Hatları ile Petrol Taşıma Anonim Şirketi. Counsel to French company in ICSID arbitration against a Turkish State-owned entity relating to breach of a gas sales agreement.
Koch Minerals Sarl and Koch Nitrogen International Sarl v. Bolivarian Republic of Venezuela. Counsel to entity in an ICSID arbitration involving the expropriation of a plant and related offtake agreement.
OI European Group B.V. v. Bolivarian Republic of Venezuela. Counsel in ICSID arbitration under the Netherlands-Venezuela BIT related to the expropriation of a glass plant.

International Commercial Arbitration

Counsel to U.S.-based business in service agreement dispute against Asian entity under SIAC Rules.
Counsel to U.S.-based defense company in UNCITRAL arbitration relating to the supply of drones to a peacekeeping mission.
Counsel to U.S.-based innovative pharmaceuticals company in ICC arbitration relating to an enterprise license agreement and related WHO prequalification, with connection to African and Asian markets.
Counsel to Bangladesh State-owned entity in ICC construction arbitration applying FIDIC, arising from the country’s first deep-sea port.
Counsel to Bangladesh State-owned entity in an UNCITRAL arbitration administered by SIAC against Azeri State-owned entity arising from drilling and exploration agreements of natural gas reserves.
Counsel to Bangladesh State-owned entity against French company in an UNCITRAL gas price reopener/revision arbitration brought by a French entity.
Counsel to a Bangladesh State-owned entity in ICC arbitration against a U.S.-based solar power company involving a large-scale solar power project and force majeure claims.
Counsel to Greek State-owned entity against a Turkish State-owned entity in an ICC arbitration arising from changing market fundamentals in connection with the decoupling of oil and gas pricing and claims regarding gas shortages claims.
Counsel to Greek entity against Turkish State-owned entity in an ICC arbitration arising from a gas sale and purchase agreement and related interconnector pipeline treaty.
Counsel to a Middle Eastern State-owned entity in a complex ICC construction dispute arising from the construction of a sewage plant.
Counsel to UAE entity in price revision dispute with a United Nations agency under UNCITRAL rules resulting from changing market fundamentals in the sale of provisions for peacekeeping missions resulting from the Ukraine-Russia conflict.
Counsel to an African State and State-owned entity in energy dispute under a joint development agreement.
Counsel to French entity in ICSID commercial arbitration relating to the purported res judicata effect of an ICC award.
Counsel to Latin-American energy company in a force majeure contractual dispute in force majeure claim arising from the COVID-19 pandemic on a petroleum storage and throughput agreement and related reallocation and refurbishment agreements.
Counsel to Latin-American energy company in a potential LCIA arbitration involving changing market fundamentals in pricing.
Counsel to a US-based energy company in an arbitration under the Swiss Rules in construction arbitration arising out of power plant construction projects in Russia.
Counsel to various Silicon Valley tech companies against Indian private entities in a series of interrelated ICDR and ICC international arbitration disputes alleging breach of contract and fraud.
Counsel to private entity in an international mediation before the ICC Dispute Resolution Board regarding a Ugandan project.
Counsel to European State-owned energy entity in a set aside proceeding before the Svea Court of Appeals.

Selective Arbitral Appointments

Presiding, sole, emergency, and co-arbitrator in cases seated in jurisdictions including London, Paris, Stockholm, New York, Washington, D.C., San Francisco, Miami, and Montreal; applying laws of Cyprus, Liechtenstein, the Netherlands, Switzerland, England & Wales, Canada, New York, California, Delaware, Florida, and Washington, D.C.
Presiding arbitrator in an ICC arbitration under New York law relating to the effects of the COVID-19 pandemic on the hospitality sector and claims under contractual excuse doctrines.
Co-arbitrator in ICDR arbitration relating to the cleantech industry.
Co-arbitrator in SIAC arbitration relating to claims of fraud and misrepresentation.
Emergency arbitrator in breach of contract claim involving the energy sector.
Emergency arbitrator in an ICDR arbitration involving an alleged Ponzi scheme and related request for an injunction involving parties in China and the U.S.
Co-arbitrator in an ICDR arbitration involving breach of contract and fraud claims arising from a joint venture agreement and related agreements involving parties in the U.S., the Ukraine, and Cyprus.
Co-arbitrator in LCIA dispute alleging breach of a sale and purchase agreement and related cybersecurity claims involving parties in China and the U.S.
Co-arbitrator in an ICC arbitration arising from an aerospace purchase agreement involving parties in the U.S., Germany, and Panama.
Sole arbitrator in an ICC arbitration involving technology relating to electric vehicles involving parties in the U.S. and Canada.
Sole arbitrator in an ICDR arbitration involving cryptocurrency regulation.
Sole arbitrator in series of AAA arbitrations involving the consequences of a massive data breach.
Sole arbitrator in a series of related AAA arbitrations involving the technology and hospitality sectors.
Sole arbitrator in AAA dispute involving cybersecurity in connection with the removal of a CEO.
Sole arbitrator in a series of AAA disputes involving cyberfraud in the financial industry.
Sole arbitrator in a AAA arbitration relating to claims under the U.S. Civil Rights Act in connection with alleged discriminatory conduct of a corporation based on race and ethnic origin.
Sole arbitrator in an ICC breach of contract case involving the fashion industry.
Sole arbitrator in an ICC arbitration involving the pharmaceutical sector.
Sole arbitrator in an UNCITRAL arbitration arising from the termination of a North-South American franchise agreement and related intellectual property rights.

Proceedings Before the International Court of Justice and Inter-State Dispute Resolution Procedures

Obligations of States in Respect of Climate Change (ICJ). Counsel to Sierra Leone, Namibia, The Gambia, and Liechtenstein in separate submissions before the International Court of Justice on climate change and international law.
Request for an Advisory Opinion submitted by the Commission of Small Island States on Climate Change and International Law (ITLOS). Counsel to Sierra Leone and Mozambique in separate submissions before the International Tribunal for the Law of the Sea on climate change and the law of the sea.
Legal Consequences of the Separation of the Chagos Archipelago from Mauritius in 1965 (request for Advisory Opinion) (ICJ). Counsel to Mauritius in advisory opinion proceedings before the International Court of Justice on whether the decolonization of Mauritius was lawfully completed in light of the United Kingdom’s excision and retention of the Chagos Archipelago.
Allegations of Genocide under the Convention on the Prevention and Punishment of the Crime of Genocide (Ukraine v. Russian Federation) (ICJ). Advised Liechtenstein on declaration of intervention in case under the Genocide Convention.
Pilav v. Bosnia and Herzegovina (European Court of Human Rights). Counsel to an intervening party in a claim before the ECtHR regarding the Dayton Accord power sharing Constitutional structure and the right to run for office and vote.
Prosecutor v. Im Chaem (Extraordinary Chambers in the Court of Cambodia). Counsel to an intervening party in a case involving crimes against humanity, torture, cruel treatment, and extrajudicial killings.
Balkan Entity v. Balkan State (European Court of Human Rights). Counsel to consortium of companies in a claim before the European Court of Human Rights involving the unlawful tender of a public works contract and the right to a fair trial.

International Litigation in U.S. Courts

Doe v. Vietnam. Counsel to Vietnam in case involving issues of sovereign immunity.
Cisco Systems Inc. et al. v. Doe I, et al. Counsel to amici former U.S. Ambassadors-at-Large for War Crimes Issue and Prosecutors of International Crimes in amicus brief before U.S. Supreme Court on scope of aiding and abetting liability under the Alien Tort Statute and Torture Victims Protection Act.
Exxon Mobil Corp. v. Corporación CIMEX, S.A. (Cuba). Counsel to amici foreign and U.S. jurists in international law and sovereign immunity in amicus brief before U.S. Supreme Court on questions of the Foreign Sovereign Immunities Act.
Idaho v. United States (U.S. Supreme Court). Counsel to amici reproductive rights NGOs arguing near-total abortion bans resulting from the reversal of Roe v. Wade implicate US obligations under international law.
Moyle et. al. v. United States (Ninth Circuit). Counsel to amici reproductive rights NGOs in connection with the reversal of Roe v. Wade and the US’ obligations under international law.
Doe v. Chiquita Brands Int.’l, Inc. (U.S. Supreme Court). Counsel to intervening party brief before the U.S. Supreme Court regarding the legal standard for lifting protective orders in cases involving survivors of torture and other grave crimes.
Esso Expl. And Prod. Nigeria Ltd. V. Nigerial National Petroleum Corp (Second Circuit). Represented Attorney General of Nigeria in arbitral award enforcement action.
Harvey et. al v. Permanent Mission of Sierra Leone (Second Circuit). Counsel to Sierra Leone in dispute and appeal under the Foreign Sovereign Immunities Act.
Simplot v. Himalaya (D.C.N.J). Represented company in arbitral award enforcement matter relating to Supreme Court decision.
Chowdhury v. Bangladesh Telecommunication Regulatory Commission (S.D.N.Y). Counsel to Bangladesh entity in telecoms dispute seeking over $2 billion.
Newman v. Permanent Mission of the Republic of Bulgaria to the United Nations (SDNY). Represented the Republic of Bulgaria in a tort claim before the Southern District of New York under the Foreign Sovereignty Immunities Act.
Professor Ahmed v. Colonel Abdi AdenMagan (SD Ohio). Counsel to the Legal Adviser to the President of Somalia in a torture claim brought under the Alien Tort Statute/Torture Victims Protection Act against a former member of the Siad Barré dictatorship.
Estate of Victor Jara v. Lt. Pedro Pablo Barrientos Nunez (MD Fla). Counsel to the family of the late folk musician, Victor Jara, in an Alien Tort Statute/Torture Victim Protection Act claim involving crimes against humanity, extrajudicial killing, and torture, cruel treatment, and arbitrary detention committed by a former member of the Pinochet dictatorship residing in the United States.
In re Hammond (Ca). Argued a petition for habeas corpus and the secured release of a victim of intimate partner battering and its effects who was wrongfully convicted of second-degree murder.
California Association of Mental Health Patients’ Rights Advocates v. California. Counsel in a disability discrimination claim against California.

UN Advisory and Other Sovereign Representation

Middle Eastern State: advised States on matters relating to usage of straits during conflict.
Private Entity: Advised private entity in UNCITRAL arbitration and negotiations with UNDP regarding price revision of peacekeeping supply agreements.
Private Entity: Advised private entity in arbitration with UNDP regarding chartering of security vehicles.
Private Entity: Advised private entity in negotiations regarding employment matters.
Private Entity: Advised private entity in settlement negotiations on provisions for peacekeeping missions.
Various States: Advised various States on matters before UNCITRAL WGs II/ III.
European State: Drafted interventions on sea level rise, the law of occupation, protection of the environment during armed conflict, and jus cogens.
European State: Advised State on various issues involving diplomatic mission.
European States: Advised State on issues relating to running mission and avoiding liability.
European States: Advised State on real estate matter.
African State: Advised State on construction matter.
Middle Eastern State: Advised State on various matters involving running of the UN Mission.
Middle Eastern State: Advised State on human rights UN advisory matter.
Middle Eastern State: Advised a Middle Eastern state on sovereign immunity and international human rights law as part of capacity-building training.
Asian State: Advised Asian State on various human rights matters before the UN Security Council.
Asian State: Advised an Asian state on claims to hydrocarbon royalty by a provincial government and questions of law of the sea.
African State: Advised State on interventions before Security Council in connection with climate change, peace and security.
African State: Advised State on the preparation of a General Assembly resolution and supporting memoranda in support of seeking an advisory opinion before the International Court of Justice.
African State: Advised State on various issues involving diplomatic mission.
Somalia: Advised Somalia on questions of international law and the draft Provisional Constitution.
European State: Advised a State on potential claims relating to state succession and unlawful expropriation.
Greek Orthodox Archdiocese of America: Prepared submissions before relevant UN bodies on the protection of cultural property, the freedom of expression, and protection of religious minorities.
US-based ECOSOC entity: Advised ECOSOC entity on climate change and law of the sea matters before UN and related underwater pharmaceuticals research project.
Asia-based ECOSOC entity: Advised entity on obtaining Observer Status.
NGOs: Advised 100+ human rights NGOs on submissions to UN Special Rapporteurs on reproductive freedom.
NGOs: Advised international women’s rights organization on development of crime of gender apartheid under international law, in collaboration with the Malala Fund.

PROFESSIONAL EXPERIENCE

Lecturer in Law, Columbia Law School (New York) (2026-present)
Lecturer in Law, USC Gould School of Law (Los Angeles) (2025-present)
Visiting Professor of Law, University of California Los Angeles (UCLA) School of Law (2024-present)
Teaching Staff, University of Piraeus, Department of International & European Studies - Energy Strategy, Law & Economics Program (2018-2020)
Adjunct Associate Professor of Law, Fordham University (2013-2016)
Graduate Student Instructor, UC Berkeley, Peace & Conflict Studies and Political Science Departments (2004-2007)

Publications

Blog Post 10/15/2026

Analyzing the Legal Landscape Since Trump’s 2025 Deep Sea Mining Executive Order

Publication 06/30/2026

Stand and Deliver: Dispute Boards and Other Mechanisms to Manage Life Sciences Disputes in Real Time

Publication 12/10/2025

U.S. Policy Shift on Foreign Aid: Key Legal Issues for USAID Contractors, NGOs, and Life Sciences Companies

Publication 10/30/2025

The BBNJ Agreement Will Enter Into Force in January 2026: What You Should Know

Publication 09/15/2025

The English Arbitration Act 2025 is now in force: what’s changed?

Media Mention 08/20/2025

Christina Hioureas in Law360: Midyear International Arbitration Trends To Watch

Media Mention 07/24/2025

ICJ Issues Landmark Climate Opinion

Media Mention 07/23/2025

ICJ Puts Reparations On The Table In Climate Change Case

Publication 06/26/2025

Climate Law Matters: Energy & Climate Newsletter - June 2025

Other Publications

Public International Law and Human Rights

“Victor Jara’s Legacy and How Music in Response to Authoritarianism Resonates Today,” Rolling Stone magazine (2026).
"Small Nations and the Role of International Law: A Toolkit," Harvard J. of Int.’l Law (2026).
"Thawing the ‘Regulatory Chill’ Effects of ISDS Claims," (with D. Ho and D. Zaleznik), Bahrain Chamber for Dispute Resolution Int.’l Arb. Rev. (2024).
"Climate, State, and Sovereignty: Self-Determination and Sea Level Rise," (with A. Torres Camprubí), Liechtenstein Institute on Self-Determination at Princeton University (2021).
"Legal and Political Considerations with respect to the Disappearance of States," (with A. Torres Camprubi), in New Knowledge and Changing Circumstances in the Law of the Sea (Brill, 2020).
"Natural Resources and the Law of the Sea," Juris Publishing (2017) (with L. Martin and C. Salonidis).
"Behind the Scenes of Protocol No. 14: Politics in Reforming the European Court of Human Rights," 24 Berkeley J. Int’l L 718 (2006).

International Commercial, Investment Treaty Arbitration and Mediation

"Law and Practice," Chambers Global Practice Guide – International Arbitration, Second Edition (2019) (with D. Schimmel).
"The Singapore Convention on International Settlement Agreements Resulting from Mediation: A New Way Forward?" Berkeley J. Int’l L (2019).
Chambers Global Practice Guide: International Commercial Arbitration, authored chapter on arbitration under U.S. law (2019) (with D. Schimmel).
"A New Legal Framework for the Enforcement of Settlement Agreements Reached Through International Mediation: UNCITRAL Concludes Negotiations on Convention and Draft Model Law," EJIL Talk, (2018) (with S. Tewarie).
"Framework Agreement between the Government of the Republic of Cyprus and the Government of the Arab Republic of Egypt Concerning the Development of Cross-Median Line Hydrocarbons Resources," International Maritime Boundaries, 1-15 (2017) (with B. Guthrie).
"Sovereignty Disputes and Offshore Development of Oil and Gas," Journal of Energy and Natural Resources Law (2017) (with B. Guthrie).
"International Commercial Arbitration: Greece," Global Arbitration Review (2016 and 2018).
"International Commercial Arbitration: Cyprus," Global Arbitration Review (2016).
"Kiobel v. Royal Dutch Petroleum: Is Corporate Liability Under the Alien Tort Statute On its Way Out?," Berkeley J. Int’l L. Publicist, Vol. 9, (2011).
"Transatlantic Environmental Regulation-Making," in in Transatlantic Regulatory Cooperation: The Shifting Roles of the EU, the US and California, Edward Elgar Publications (2011) (with B.Cain).
"Glamis Gold, Ltd v. United States: A Case Study on Disclosure Procedure in International Arbitration," 2 World Arb & Mediation Rev 3 (2008) (with V. Camerer).
"US Discovery in Aid of International Legal Proceedings: Developments Since the Intel Decision Under Section 1782," 4 Deutsch-Amerikanische Juristen-Vereinigung 177, (2006) (with P. Thompson).

Honors & Involvement

HONORS

Chambers & Partners – USA: Arbitrators (Band 3) (2020-present) ("Christina’s work as an arbitrator is outstanding. She prepares for each hearing thoroughly and is a balanced and efficient arbitrator.")
Chambers & Partners – Global: Arbitrators (Band 3) (2025-present) (“She has built an incredible practice at Foley focused on public international law and representing states in major arbitrations. She is also a next-generation leader as arbitrator, where she is thought of as exceedingly thoughtful, extremely prepared and detail-oriented. She is one of the clear leaders of public international law in the US.”)
Chambers & Partners – Global: Public International Law (Band 4) (2020-present) ("She is able to think like a lawyer, state representative, and a business person all at the same time"; "meticulous, prompt and sensitive to the needs of state-side clients.")
Chambers & Partners – USA: International Arbitration (Band 4) (2020-present) ("Christina has excellent commercial awareness and can keep the big strategic issues in mind with a command of the detail of the case.")
Chambers & Partners – Global: Arbitration - Global Market Leaders (Band 5) (2024-present) ("a formidable advocate.") and (“Her past experience and knowledge in cases similar to our situation bring a level of confidence as we move through this process.”)
Chambers & Partners – USA: Arbitration Counsel (Band 4) (2021- present) ("She is a skilled investigator, case strategist, and disciplined team leader. Christina is able to investigate and distill complex technical information into clear and persuasive arguments.")
Lexology International Arbitration – “Most Highly Regarded Partner - The Americas” (2023) and “Thought Leader” (2018-present). ("Christina Hioureas has performed exceptionally this year with market commentators praising her for ‘looking at problems from different angles and identifying the key issues that really matter for her clients.")
Legal 500: International Arbitration, International Litigation – Leading Partner (2021-24)
Financial Times "Top 10 Most Innovative Lawyers- North Americas" (2024)
Hellenic Lawyers Association, "Attorney of the Year" (2022)
Center for Justice & Accountability "Partners in Justice Award" (2024), for contributions to transitional justice in Chile, Cambodia, and other jurisdictions
Center for Justice & Accountability "Partners in Justice Award" (2018), for Jara v. Barrientos, holding former Lt during Pinochet dictatorship liable for torture and extrajudicial killing
Center for Justice & Accountability "Partners in Justice Award" (2013), for Ahmed v. Magan, holding Somalia's notorious National Security Service accountable for human rights violations

INVOLVEMENT

Panel of arbitrators: LCIA, AAA, ICDR, DIS, USCIB/ICC, Asia International Arbitration Centre, CPR Panel of Distinguished Neutrals (Energy, Oil and Gas; Banking and Financial Services; Franchise; and General Commercial Panels), UNCLOS, and Court of Arbitration of Montenegro.
ICC Commission on Arbitration & ADR, U.S. Member
Board of Directors, New York International Arbitration Center (NYIAC)
UN Development Programme – Nature, Climate & Energy, Senior External Legal Adviser
Council on Foreign Relations, Term Member
International Law Association, Committee on Sea Level Rise (Greece)
American Society of International Law (ASIL), Executive Council

Events

Speaking Engagement 09/29/2026

GAR Live: North America

Speaking Engagement 06/10/2026

ITA Workshop and Annual Meeting

Foley Hoag Event 04/22/2026

Foley Hoag at ASIL Annual Meeting 2026

Sponsorship 03/26/2026

GAR Awards 2026

Foley Hoag Event 03/25/2026

Power and International Law: What Role for International Arbitration?

Speaking Engagement 03/10/2026

When the World Shifts: Navigating Geopolitical Risk, Energy Transition, and Climate Disputes in Arbitration

Speaking Engagement 01/23/2026

14th ITA-IEL-ICC Joint Conference on International Energy Arbitration - Houston

Foley Hoag Event 11/20/2025

Arbitration across borders: recent developments in leading seats

Speaking Engagement 11/10/2025

Christina Hioureas to Teach Certificate in International Commercial and Investment Arbitration

Foley Hoag Event 10/27/2025

UN Law Week

Speaking Engagement 10/23/2025

Current Challenges and Strategies in the US Compliance Landscape

Speaking Engagement 07/09/2025

Christina Hioureas to speak at 1st Global Summit of Hellenic Lawyers

Speaking Engagement 05/08/2025

Foley Hoag Attorneys to Speak at conference on War & Peace and International Arbitration at Bocconi University

Sponsorship 04/16/2025

Foley Hoag at ASIL Annual Meeting 2025

Speaking Engagement 04/04/2025

Christina Hioureas to speak at 26th Annual International Bar Association Arbitration Day

Sponsorship 03/10/2025

2025 California International Arbitration Week (CIAW)

Event 02/27/2025

Foley Hoag shortlisted as Africa-Wide Law Firm of the Year: Dispute Resolution

Speaking Engagement 10/26/2024

Arbitrating with International Organizations

Sponsorship 10/09/2024

Christina Hioureas to Chair the American Society of International Law Gala

Speaking Engagement 09/26/2024

Contracting and Arbitrating with States and State-owned Entities: Emerging Trends, Challenges and Best Practices

Speaking Engagement 09/25/2024

Independence and Impartiality of Arbitrators: Disclosure, Challenges, Removals

Sponsorship 09/05/2024

European Society of International Law Annual Conference

Speaking Engagement 06/08/2024

Center for International Legal Studies International Arbitration Symposium

Foley Hoag Event 03/21/2024

How Can Arbitration Best Serve the Energy Transition?

Foley Hoag Event 02/29/2024

ESG: International Governance, Reporting and Dispute Resolution

Foley Hoag Event 10/26/2023

The ILC: Strategies for Effective State Engagement

Foley Hoag Event 09/20/2023

Independence and Impartiality of Arbitrators: Disclosure, Challenges, Removals

Foley Hoag Event 06/15/2023

The BBNJ Agreement: What is it and what does it mean for States and Private Actors?

Foley Hoag Event 03/30/2023

Correcting Asymmetry: Human Rights and Environment-Based Counterclaims in Investor-State Dispute Resolution

Foley Hoag Event 03/28/2023

Paris Arbitration Week: Resolving Disputes Arising From Climate Change, Peace and Security

Foley Hoag Event 12/05/2022

Implementing the Duty to Prevent Genocide under International Law

Foley Hoag Event 10/27/2022

Recent Developments with Respect to Interventions by Third States in State-to-State Disputes

Event 02/18/2021

Recent Developments in the Protection of Cultural Heritage

Foley Hoag Event 12/10/2020

State Control of Internet Access, Freedom of Press, and Atrocity Situations

Speaking Engagement 07/23/2020

Ensuring Efficiency in Complex Technology Disputes

Speaking Engagements

Public International Law and Human Rights

“Making Use of the Advisory Opinion on Climate Change in the International and Regional Context,” United Nations Development Programme (Nairobi, Kenya, 2026).
"From Coast to Court: Sea Level Rise, the ICJ, and the State of International Law," (American Society of International Law, 2026).
“The Legal Status and Future of the British Bases in Cyprus,” Cyprus Bar Association (Nicosia, Cyprus, 2026).
“Small Nations and the Role of International Law”, Permanent Mission of Egypt to the United Nations (New York, 2026).
“Beyond Neutrality: Private International Law in a Multipolar World,” (University of California, Berkeley School of Law, 2026).
“Small Nations, Climate Change, and the Role of International Law,” (Stanford Law School, 2026).
“Small Nations and the Role of International Law,” (Nicosia, Cyprus, 2025).
“Where will future disputes involving States be heard?,” 26th Annual International Bar Association Arbitration Day (London, 2025).
“Climate Change Advisory Opinions: Debrief and Analysis,” UN Headquarters (New York, 2025).
“The Law of State Responsibility: Exploring Its Past, Present and Future,” Permanent Mission of Italy (New York, 2025).
“Side Event on the Law of Responsibility,” Permanent Mission of Italy (New York, 2025).
“Safeguarding Democracy, Rule of Law and Justice: Global Challenges and the Role of Artificial Intelligence (AI),” 1st Global Summit of Hellenic Lawyers (Athens, 2025).
“Arbitrating with International Organizations,” International Law Weekend 2024 (New York, 2024).
“Re-Centering Global Climate Change Discourse: The Role of SIDS in Advocacy and Action,” SIDS4 Conference (2024).
“Can Climate Change Litigation by Small Island States Address Their Goals?,” American Society of International Law Annual Meeting (Washington, DC, 2024).
“International Legal Mechanisms as Human Rights Accountability Measures,” Wolfgang Friedmann Conference of Columbia Society of International Law (New York, 2024).
“The ILC: Strategies for Effective State Engagement,” Foley Hoag (New York, 2023).
“The Human Rights Dimension to the International Court of Justice’s Advisory Opinion on Climate Change,” United Nations Headquarters (New York, 2023).
“Implementing the Duty to Prevent Genocide under International Law,” Assembly of States Parties to the Rome Statute (The Hague, 2022).
“Interventions by Third States in State-to-State Disputes,” UN Law Week (New York, 2022).
“Legal and Political Considerations on Questions of Sea Level Rise and Statehood,” (Rising Sea Levels and AALCO Member States, 2022).
“Sierra Leone’s Landmark Accession to the New York Convention: Significance, Opportunities, Challenges and the Next Steps,” (Virtual, 2021).
“Recent Developments in the Protection of Cultural Heritage,” (Virtual, 2021).
“The Evolution of the Alien Tort Statute and the Implications for International Human Rights Law,” Berkeley Law (Virtual, 2020).
“ASIL Midyear Meeting: Practitioner’s Forum,” Co-Chair (Virtual, 2020).
“Climate, State and Sovereignty: Self-Determination and Sea-Level Rise,” Liechtenstein Institute on Self-Determination at Princeton University (Princeton, 2020).
“Defense of Land and Water as a Strategy to Eradicate Poverty,” UN Headquarters (New York, 2017).
“Transboundary Groundwater and International Law: Water, Peace, and Security.” Protection and Management of Transboundary Groundwater: Legal Issues and the Human Right to Water, UN Headquarters (New York, 2016).

International Commercial, Investment Treaty Arbitration and Mediation

Co-Chair, ICC Advanced Arbitration Academy for North America Workshop (2026-2027).
“The Core Principles of International Arbitration: Procedural Integrity: Standards, Safeguards, and Challenges,” The Arbitration Channel, Columbia Law School and NYU School of Law (New York, 2026).
“Times They Are a Changin’,” GAR Live North America (New York, 2026).
“Independence and Impartiality of Arbitrators,” Roma Tre University School of Law (Rome, 2026).
“Arbitrating with a State: Issues when Contracting with States and State-Owned Entities,” ITA Workshop and Annual Meeting (Houston, Texas, 2026).
“The Rule of Law and International Arbitration,” Practising Law Institute (New York, 2026).
“SSDS in Investment Treaties: Rationale and Policy Issues,” OECD Annual Conference on Investment Treaties (Paris, 2026).
“Power and International Law: What Role for International Arbitration?” Foley Hoag Event at Paris Arbitration Week (Paris, 2026).
“When the World Shifts: Navigating Geopolitical Risk, Energy Transition and Climate Disputes in Arbitration,” (San Francisco, 2026).
“From Award to Assets: Enforcing Commercial Arbitration Awards Across Jurisdictions,” (Miami, 2026).
“Arbitration Across Borders: Recent Developments in Leading Seats,” Foley Hoag Event (New York, 2025).
“The Search for Justice After Conflict through Claims Commissions & Tribunals and Arbitration,” Bocconi Annual International Arbitration Conference (Milan, 2025).
“Arbitrations Involving States: Unique Features and Challenges,” AA40 Conference on the margins of the Bocconi Annual International Arbitration Conference (Milan, 2025).
“12th edition of the Certificate in International Commercial and Investment Arbitration,” Roma Tre University School of Law and the Italian Association for Arbitration (AIA) (Rome, 2025).
“Safeguarding Democracy, Rule of Law and Justice: Global Challenges and the Role of Artificial Intelligence (AI),” 1st Global Summit of Hellenic Lawyers (Athens, 2025).
“Investor-State Dispute Settlement and Climate Change Regulation: A Chilling Effect on States or a Tool for Promoting Economic Development?,” Stanford Law School (California, 2025).
“Independence and Impartiality of Arbitrators: Disclosure, Challenges, Removals,” Roma Tre University School of Law (Rome, 2024).
“Contracting and Arbitrating with States and State-owned Entities: Emerging Trends, Challenges and Best Practices,” 19th ICC New York Conference on International Arbitration (New York, 2024).
“Working with a Damages/Quantum Expert,” New York International Arbitration Center (New York, 2024).
“How can Arbitration Best Serve the Energy Transition?,” Paris Arbitration Week (2024).
“ISDS Tech Disputes – An Incoming Wave?,” GAR Live: Technology Disputes (San Francisco, 2024).
“Procedural Toolkit for Efficient and Cost-Effective Arbitration,” Columbia Arbitration Day (New York, 2024).
“ESG: International Governance, Reporting and Dispute Resolution,” Foley Hoag (New York, 2024).
“Geopolitical Changes Affecting Dispute Resolution in MENA,” Cyprus Arbitration Day (Cyprus 2023).
UNCITRAL Academy Conference 2023, "Investor-State Mediation,” Singapore Mediation Week (2023).
“Reform in International Investment Arbitration,” George Washington University (2023).
Certificate in International Commercial and Investment Arbitration, “Independence and impartiality of arbitrators: disclosure, challenges, removals” (Rome, 2023).
ABILA International Law Weekend, “Rethinking Solutions to International Disputes?” (NY, 2023).
“Reform in International Arbitration,” GW - International Arbitration Students Association, (2023).
“Contractual Excuse Doctrines,” ITA-ICC Conference (Houston, TX, 2023).
“The Future of Investment Arbitration,” Center for International legal Studies (Salzburg, Austria, 2022).
“Dispositive Relief in International Arbitration,” (International Law Association, London, 2022).
“Missed Opportunities in Approaching Arbitration Cases,” (New York State Bar Association, 2021).
“State Defenses and Counterclaims,” Executive Course on International Investment Law and Arbitration, (Queen Mary University of London, School of International Arbitration, 2021).
“The Singapore Convention – Two Years Later,” (New York State Bar Association, 2021).
“Innovative Defense Strategies in Investor-State Dispute Settlement,” (Uzbek Arbitration Week (Tashkent, 2021).
“Strengthening Atrocity Crime Cases with Digital Evidence: New International Standards on Digital Open Source Investigations,” (Virtual, 2021).
“Mediation the World Over,” Third Annual Schiefelbein Global Dispute Resolution Conference (Virtual, 2021).
“State Control of Internet Access during Atrocity Situations,” Nineteens Session of the Assembly of States Parties to the Rome Statute of the International Criminal Court (Virtual, 2020).
“Ensuring Efficiency in Complex Technology Arbitrations,” Silicon Valley Arbitration and Medication Center (Virtual, 2020).
“Representing States and State-owned Entities,” 35th Annual Joint Symposium of Arbitrators, Queen Mary University of London and ICC Institute of World Business Law (London, 2020).
“Gentle Force of Compromise: Mediation,” Asia ADR Week, (Kuala Lumpur, Malaysia, 2019).
“Efficiencies and Alliances in Public-Private Partnerships: Regulatory and Institutional Factors for Dispute Resolution Hubs,” Singapore Convention Signing Ceremony & Conference (Singapore, 2019).
“Technology and Arbitral Players,” Young ICCA-ICC YAF (Mexico City 2019).
“Tribunal Dynamics: Selection of Arbitral Tribunal from the Counsel and Arbitrator Perspective,” American Arbitration Association (New York, 2019).
“Parallel Proceedings in Arbitration,” New York State Bar Association (2019).
“The Singapore Convention on Mediation: Expert Perspectives on its Significance for the Future of Dispute Resolution,” UNCITRAL WG III event (New York, 2019).
“The Singapore Convention on the Enforcement of Agreements Achieved Through International Mediation: A New Way Forward?” The Elegance of International Law: In Commemoration of Professor David D. Caron (Berkeley, 2018).
“Introduction to International Dispute Resolution,” Yeosu Academy of International Law (Yeosu, Republic of Korea, 2017).
“International Water Conflict and Cooperation: Grappling with the Allocation of Freshwater Between States in the Face of Climate Change,” 95th Annual Meeting of the American Branch of the International Law Association, International Law Weekend (New York, 2017).
“The Potential Effects of Rising Sea Levels,” 18th Open-Ended Informal Consultative Process on Oceans and the Law of the Sea, The Effects of Climate Change on Oceans, United Nations Headquarters (New York, 2017).
“Climate Change Arbitration: The Key to 'Climate Justice for All' After the Paris Agreement,” ABA Section of International Law, (Washington, D.C., 2017).
“Recent Developments in Investment Treaties and Dispute Settlement Systems: Efforts by U.N. Member States for a More Balanced Way Forward,” New York Bar Association, Committee on the United Nations (New York, 2017).
“Silk Road Energy Projects - Oil & Gas, Nuclear, Renewables,” The Silk Road Summit - 1st Annual Conference: Exploring Business, Trade & Investment Opportunities on the New Silk Road, (Washington, D.C., 2016).