A member of the firm's International Dispute Resolution Practice Group, Tomás Solís brings a distinctly global perspective to his work. His professional background includes work in government, international organizations and the international offices of leading global law firms and before international adjudicative bodies, as well as the study of international law and policy at the post-graduate level.  

    Tomás focuses his practice on international law, arbitration and mediation. He represents sovereign governments in international arbitrations arising under bilateral investment treaties, free trade agreements, national investment legislation and contracts. He also advises sovereign governments around the world on boundary disputes. He is recognized in Volume IV of The Latino American Who’s Who.

    Tomás spent five years as counsel to the International Centre for Settlement of Investment Disputes (ICSID) in Washington DC. As secretary to arbitral tribunals, he administered a number of arbitral proceedings conducted in English, Spanish and French and involving countries in Latin America, Europe, Asia and Africa and initiated under investment treaties, contractual provisions and national law.

    In another prior position, as a legal advisor to the Government of El Salvador, Ministry of Foreign Affairs, Tomás served on a team that represented El Salvador before the International Court of Justice, seeking revision of a judgment rendered in a land dispute with a neighboring government. Tomás also served as a prosecutor in the Fraud and Assets Control units of the attorney general’s office of El Salvador.

    Tomás lectures and publishes frequently on matters related to international law and conflict resolution. As a visiting lawyer to the Paris offices of two global law firms, he conducted legal research on international law and arbitration and assisted in the preparation of treaty arbitration between private companies and sovereign governments.

    Tomás is a member of the Advisory Committee of the Squire Patton Boggs Foundation, which promotes the role of public service and pro bono work in the practice of law and the development of public policy.

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    • Georgetown University Law Center, LL.M., 2004
    • Universidad Doctor Jose Matias Delgados, El Salvador, Licenciado, 2002
    • Rhodes Academy for Oceans Law and Policy, Diploma, International Law of the Sea, 2001


    • District of Columbia, 2018
    • New York, 2009

    Memberships and Affiliations

    • Member, ICC Latin American Group

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    • Author, “Decisiones Recientes en Casos de Anulación ante el CIADI, El Caso de Argentina y la Consistencia en la Jurisprudencia de Anulacion,” Anuario Latinoamericano de Arbitraje, 2012
    • Author, The International Law on Expropriation, American University Washington College of Law, March 2012.
    • Author, Investment Arbitration: A closer look beyond JCSID: Investment Arbitration Outside the Realm of Bilateral Investment Treaties, Florida International University School of Law, November 2011.
    • Presenter, “Desarrollo Practico de un Arbitraje Internacional,” IV Congreso Peruano Internacional de Arbitraje, Lima, Peru, April 29-30, 2010.
    • Presenter, “Arbitraje Internacional de Inversiones,” Cámara de Comercio de Santiago, Chile, November 13, 2009.
    • Presenter, “Curso Avanzado de Capacitación Sobre Administración de Controversias en Materia de Inversión,” UNCTAD, Santiago de Chile, November 11-12, 2009.
    • Lecturer, “Investor-State Dispute Settlement,” International Arbitration Summer Session, American University Washington College of Law, May 2009.
    • Presenter, “Resolución de Conflictos entre Estado e Inversionista Internacional, sus raices en el Derecho Internacional Público,” Arbitraje Comercial Internacional y Arbitraje de Inversión, Escuela Superior de Economía y Negocios, El Salvador, June 2008.
    • Presenter, “Las Reglas de Arbitraje del CIADI,” Arbitraje y Proteccion de Inversiones en el Derecho Internacional, Universidad del Istmo, Guatemala, September 2007.

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