Ari D. MacKinnon


New York
T: +1 212 225 2243
F: +1 212 225 3999

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Ari D. MacKinnon is a partner based in the New York office.

Mr. MacKinnon’s practice focuses on litigation.

Mr. MacKinnon 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.

Mr. MacKinnon also represented an international financial institution in the successful resolution of various civil litigations and regulatory investigations in Italy, arising out of the suspension of certain unit-linked insurance policies during the financial crisis from 2008 through 2011.

Mr. MacKinnon joined the firm in 2009 and became a partner in 2015.  In 2006, he received a J.D. degree, magna cum laude, Order of the Coif, from New York University School of law, where he was an editor of the New York University Law Review and a winner of the Maurice Goodman Memorial Prize for outstanding scholarship and character, and the Judge Abraham Lieberman Award for outstanding scholarship in the area of Criminal Law.  Mr. MacKinnon earned a master’s degree in Spanish from Middlebury College in 2003.  He completed his undergraduate studies with honors at Grinnell College in 2002.  From 2006 through 2008, Mr. MacKinnon served as a law clerk to the Honorable Shirley Wohl Kram of the U.S. District Court for the Southern District of New York.  From 2008 through 2009, he served as a law clerk to the Honorable Bruce M. Selya of the U.S. Court of Appeals for the First Circuit.

Mr. MacKinnon is a member of the Bar in New York.  His native language is English, and he is fluent in Spanish.


  • New York University School of Law
    (J.D., 2006)
  • Middlebury College
    (M.A., 2003)
  • Grinnell College
    (B.A., 2002)


  • Spanish