- Appointed to the Panel of Arbitrators of the British Virgin Islands International Arbitration Centre (BVIIAC), June 2022
- Elected Member American Arbitration Association-ICDR Council, May 2022
- Advisor to the Corte de Arbitraje de Madrid and member of its “Comisión de Recusaciones y Autorización de Intervención de Terceros” (2019 – present)
- Member of the International Centre for Dispute Resolution (ICDR) International Panel (2019 – present)
- List of Arbitrators, Corte de Arbitraje de la Cámara de Comercio Americana del Perú (AmCham)
- List of Arbitrators, Centro de Arbitraje de la Cámara de Comercio de Lima (CCL), Perú
- Official Observer at the UNCITRAL Working Groups II and III (Arbitration/Dispute Resolution and ISDS Reform) in New York and Vienna (2008 – present)
- Acted as expert for UNCITRAL, including on matters pertaining to current and future work
- Member of the IBA Sub-Committee on Investment Arbitration (since 2016)
- Argentine Member of the ICC Commission on Arbitration (2010 – present)
- Task Force on Controlling Time and Costs in Arbitration
- Task Force on the Probative Value of Witness Evidence
- Task Force on the Revision of ICC Rules as Appointing Authority in UNCITRAL or other Ad Hoc Arbitration Procedures
- Task Force on Resolving Climate Change Disputes through Arbitration and ADR
- Task Force on Addressing issues of Corruption in International Arbitration
- Member of the ICC Institute of World Business Law (2011 – present)
- Director, Columbia Law School Alumni Association (2002 – 2012)
- Director, American Foreign Law Association (1976 – 2010)
- Member, New York City Bar Association, Committee on International Commercial Dispute Resolution (2003 – 2009)
- Member, New York City Bar Association, Committee on Foreign and Comparative Law (1999 – 2001)
- Member, New York City Bar Association, Committee on International Law (1996 – 1998)
- Vice-Chair, Program Committee of the International Law Weekend (1994 – 2001)