Ari D. MacKinnon’s practice focuses on enforcement, international arbitration and securities litigation.

He is representing an international financial institution in parallel investigations being conducted by, among others, the U.K. Financial Conduct Authority, U.S. Department of Justice, and the U.S. Commodity Futures Trading Commission, relating to the FX market. He is also counsel to this same institution in regulatory investigations in the United States related to the setting of the ISDAFIX.

Ari is representing a Latin American oil and gas company in a Spanish-language arbitration relating to the termination of an oil concession. Additionally, he is counsel to the Latin American affiliates of international oil and gas companies in an ICC arbitration in New York relating to the interpretation of a gas sales agreement.

Ari is also counsel to an international financial institution in clawback actions brought by the Trustee of the Madoff Estate in connection with the Bernie Madoff Ponzi scheme.

Ari joined the firm in 2009 and became a partner in 2015.

Selected Activities

  • Law Clerk to the Honorable Shirley Wohl Kram of the U.S. District Court for the Southern District of New York, 2006-2008; and to the Honorable Bruce M. Selya of the U.S. Court of Appeals for the First Circuit, 2008-2009