Martinez, Alexis

Alexis Martinez


Alexis is a partner in our International Dispute Resolution Group. He is qualified in both England and France and has over a decade’s experience working on investment treaty and commercial arbitrations in English, Spanish and French.

Highlights of Alexis’ investment treaty arbitration experience involve the successful representation in multiple cases of Slovakia, the Czech Republic, Uzbekistan and other states. He has also acted for claimants against states in 11 cases in Latin America, Africa, Asia and the Caribbean, all of which resulted in favorable multimillion awards or settlements.

Alexis’ recent commercial arbitration successes involve several pricing disputes under long-term natural gas and LNG contracts, and include the payment of hundreds of millions of US dollars to clients in two such cases. His commercial arbitration practice encompasses complex energy, construction, mining, and financial disputes.

Alexis has extensive experience advising sovereigns and international companies on public international issues, such as the extent and international impact of sovereign rights, international sanctions, and the application of international treaties.

Alexis also has experience acting as arbitrator.


Investment-treaty Arbitration

  • Representing the government of Slovakia in EuroGas Inc. and Belmont Resources Inc. v. Slovak Republic, ICSID Case No. ARB/14/14, and in Spółdzielnia Pracy "Muszynianka" v. The Slovak Republic, PCA Case Nº AA629.
  • Acting for the investor in Millicom International Operations B.V. et al. v. Republic of Senegal, ICSID Case No. ARB/08/20, which was recently settled on innovative terms very favorable to the investor. 
  • Acted in numerous investment treaty arbitrations on behalf of investors against, inter alia, Mexico, Belize, Sri Lanka, various European countries and Argentina.
  • Successfully represented the Republic of Turkey and the Republic of Uzbekistan.  

Commercial International Arbitration

  • Acting successfully for the Republic of Gabon in a dispute concerning the development of a special economic zone.
  • Acting on behalf of a large Chinese state-owned mining company defending a claim arising from a natural resources transaction. 
  • Acting on behalf of a European oil and gas company against an Asian state.
  • Successfully defending a claim brought by a sub-contractor against a large construction company in relation to the construction of a university hospital in the Middle East. 
  • Has mediation experience, having represented a Russian state-controlled oil and gas company in the mediation of a significant dispute concerning the construction of a petroleum refinery.
  • Advised a French alternative energy company in relation to a potential dispute with an African state-owned entity. 

Public International Law

  • Advising a European telecommunications company on the international law commitments of an Asian country.
  • Advising a large European bank on the international law consequences of legislation enacted by a European country. 
  • Advised oil and gas companies on the impact of international sanctions against a North African country and the validity under international law of certain natural resources derived rights.
  • Acted bro bono for UNHCR in matters arising from the Refugee Convention, such as QD (Iraq) v. Secretary of State for the Home Department, and YS (Egypt) v. Secretary of State for the Home Department.


  • Panthéon-Assas University, DEA, Droit des Relations Economiques Internationales, 2002
  • Panthéon-Assas University, Maitrise en Droit, 2001
  • University College London, Diploma, English Law, 2001
  • Panthéon-Assas University, Licence en Droit, 2000


  • England and Wales, 2007
  • France, 2004

Memberships and Affiliations

  • Member, Study group on the Practice and Procedure of International Tribunals, International Law Association
  • Member, LCIA, The London Court of International Arbitration
  • Member, YAG, The Association Suisse d'Arbitrage
  • Member, YAF, The International Chamber of Commerce
  • Member, Young & International, ICDR
  • Member, Club Español del Arbitraje
  • Member, The Moot Alumni Association


  • English
  • French
  • Spanish

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Speaking Engagements

  • Speaker, “Clash Between the Common Law and Civil Law Approach in International Arbitration - Differences in Advocacy and Pleading”, YAF – Cambridge Arbitration Day, University of Cambridge, 17 March 2017.
  • Moderator, “Party Representation Costs, and Costs of the Arbitration”, Young ICCA – Kosovo Permanent Tribunal of Arbitration, 23 February 2017.
  • Speaker, “Investor Treaty Arbitration in the Central and Eastern Europe: a regional experience”, Kosovo Arbitration Days, Kosovo Permanent Tribunal of Arbitration, 22 February 2017.
  • Speaker, “Salient issues in BIT and ICSID Arbitration”, Symposium: Salient Issues in International Commercial Arbitration, Center on International Commercial Arbitration of the American University's Washington College of Law, November 2015.
  • Speaker, “Building Blocks of a Successful International Arbitration Career”, ICC YAF conference.
  • Speaker, “International Arbitration: The Reality”, legal seminar.
  • Speaker, 15th Croatian Arbitration and Conciliation Days: State Defences in Bilateral Investment Treaty Arbitration.
  • Arbitration in Africa: Past, Present, and Future, Kluwer Arbitration Blog, 13 January 2016.
  • “A Modest Proposal for Preventing Multipartite Arbitrations from Being a Burden to the Parties and for Making Them Beneficial to the Parties,” 5 Am. U. Bus. L. Rev. 355, 2015-2016.
  • “The International Chamber of Commerce's Note on the Appointment, Duties and Remuneration of Administrative Secretaries dated 1 August 2012", 6 International Arbitration Law Review (2012) p. 50.
  • Le Pouvoir d’Intervention des Juridictions Indiennes dans l’Arbitrage, 1 Cahiers de l’Arbitrage 9 (2013).
  • The International Chamber of Commerce's Note on the Appointment, Duties and Remuneration of Administrative Secretaries, 6 Internationl Arbitration Law Rev 50 (2012).
  • P.R.I.M.E. Finance – benefits and challenges, Allen&Overy Publications, 31 October 2012.
  • Resource nationalism: Protecting Investor's rights, Mining Journal, 2 March 2012.
  • “Dallah, a Tale of Two Judicatures”, 4 Int'l Arbitration Law Rev., 2011.
  • “Reform of French Arbitration Law”, Practical Law Company, 1 March 2011.
  • “Changes to the VAT Treatment of Arbitration Services in the EU”, 7-1 TDM, 2010.
  • Chapter on “Invoking State Defences in Investment Treaty Arbitration” in “The Backlash against Investment Arbitration”, Kluwer Law International, 2010.
  • Chapter on “Investment Arbitration” in “International Arbitration Checklists” Juris, 2009.
  • “Analysing The Growth Of Islamic Law In International Arbitration And Dispute Resolution”, 24-1 Mealey's Intl. Arb. Rep. 20, 2009.
  • “Is Invoking State Defences In Investment Arbitration A Waste Of Time And Money?”, 15 Croatian Arbitration Yearbook 89, 2008.
  • “Noble Energy Inc & MachalaPower Cia Ltda v. Ecuador & Consejo Nacional de Electricidad Case Report”, 23-9 Mealey's Intl. Arb. Rep. 16, 2008.
  • “Can A Commercial Arbitral Award Be Enforced Through ICSID Proceedings? The Case Of Saipem v. Bangladesh”, 22-6 Mealey's Int. Arb. Rep. 1, 2007.