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Stephan Adell


Santo Domingo, Dominican Republic
Calle Rafael Augusto Sánchez # 86 
Roble Corporate Center, 7th floor
+1 809 792 5200
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A dual Bolivian-French national with over 15 years of international arbitration experience, Stephan Adell’s practice focuses on international commercial and investment arbitration. He has intervened in over 100 international arbitrations, particularly focusing on complex construction and investor-State disputes. He also acts as arbitrator.

Stephan has acted under major arbitration rules and institutions such as the International Centre for Settlement of Investment Disputes (ICSID), the United Nations Commission on International Trade Law (UNCITRAL), the International Chamber of Commerce (ICC), the London Court of International Arbitration (LCIA), the Dubai International Arbitration Centre (DIAC) and the International Centre for Dispute Resolution (ICDR).

He has acted as counsel in more than 35 investment arbitrations. In Latin America, Stephan has acted in arbitrations in Argentina, Bolivia, Brazil, Chile, Costa Rica, Dominican Republic, Ecuador, Guatemala, Mexico, Peru, and Venezuela.

Stephan was a member of the International Arbitration Court of the ICC for 6 years. Before founding Adell & Merizalde, he worked at two top-tier firms in international arbitration (Paris and Dubai offices).

He is co-chair of the ICC Advanced Arbitration Academy for Latin America and teaches Arbitration Law and Alternative Dispute Resolution at Instituto OMG.

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Bar Admissions

  • Dominican Republic

  • Paris


  • Université de Versailles, Master International Law and International Arbitration 

  • Université Paris 2, Panthéon-Assas, Diploma in Comparative Law 

  • Pontificia Universidad Católica Madre y Maestra, Law Degree 


  • Spanish

  • English

  • French

Relevant Matters

  • Represents the Republic of Costa Rica in an ICSID arbitration filed by German investors related to the expropriation of an eco-touristic property. Ongoing case.

  • Represents a European intergovernmental organization in an international ad hoc arbitration based in Munich, Germany, regarding delays and alleged cost overruns in the construction of a large-scale scientific project in a South American country. Ongoing case. 

  • Represents a South American public entity in an ad hoc arbitration arising from the construction of a highway. Ongoing case.

  • Represents a Central American fruit company in an ICC arbitration based in Miami, Florida, concerning the termination of a long-term distribution contract. Ongoing case. 

  • Represents a Central American Company in an ICC arbitration seated in Houston, Texas, against several respondents in relation to a large photovoltaic energy project in the Dominican Republic.  Ongoing case.

  • ​Represented the Republic of Costa Rica in an ICSID arbitration filed by a Spanish investor related to the closure of poultry production facilities.  Over US$ 100 million in dispute.

  • ​Represented a South American State in a PCA investment arbitration under UNCITRAL rules initiated by a US investor concerning the modernization of an oil refinery.  Over US$ 110 million in dispute. 

  • ​Represented the Republic of Kosovo in an ICSID arbitration initiated by a German investor concerning the tender for the privatization of the postal communication company.  Over US$ 400 million in dispute​

  • Represented the Republic of Turkey in an ICSID arbitration brought by investors from the Netherlands for the sale of assets of a large mobile phone company.  Over US$ 19 billion in dispute. 

  • ​Represented an Eastern European State in 2 arbitrations (PCA and ICSID) against a Hungarian investor relating to various regulatory measures on a gas trading business.  Over US$ 1 billion in dispute.

  • Represented a South American public entity in an ICC arbitration against a US services supplier for goods relating to oil & gas drilling.  Over US$ 250 million in dispute.

  • Represented a Middle Eastern company in an ICC arbitration seated in Paris, under Swiss law against a European enterprise concerning design defects and delays in the construction of an MDF plant.  Over US$ 100 million in dispute.​

  • Represented a European public entity in an ad hoc arbitration seated in Santiago under Chilean law against a South American constructor regarding defects and delays in the construction of a highway.  The language of the arbitration was English.  Over US$15 million in dispute.

  • ​Represented a Latin American public entity in 3 ICC oil & gas arbitrations seated in The Hague under Dutch law.  Over US$ 300 million in dispute.

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