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Kaplan Fox & Kilsheimer LLP

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Gregory Arenson

Work 212-687-1980
Kaplan Fox & Kilsheimer LLP

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Kaplan Fox & Kilsheimer LLP


Gregory K. Arenson is a seasoned business litigator. Although he has experience representing clients in a variety of areas, including antitrust, securities, and employee termination, he specializes in antitrust cases. His economics background has provided a foundation for his recognized expertise in handling complex economic issues both as to class certification and on merits. Prior to joining Kaplan Fox, Mr. Arenson was a partner with Proskauer Rose. Earlier in his career, he was a partner with Schwartz Klink & Schreiber, and an associate with Rudnick & Wolfe (now DLA Piper).




Mr. Arenson is active in the New York State Bar Association. He is a member of the House of Delegates. He was Chair of the Commercial and Federal Litigation Section from June 2013 through May 2014. He has been Co-Chair of the New York State Bar Association Task Force on the State of Our Courthouses, whose report was adopted by the House of Delegates on June 20, 2009; a member of the New York State Bar Association Special Committee on Standards for Pleadings in Federal Litigation, whose report was adopted by the House of Delegates on June 19, 2010; and a member of the New York State Bar Association Special Committee on Discovery and Case Management in Federal Litigation, whose report was adopted by the House of Delegates on June 23, 2012. He also serves as a mediator in the U.S. District Court for the Southern District of New York. In addition, he is an active alumnus of the Massachusetts Institute of Technology, having served as a member of the Corporation, a member of the Corporation Development Committee, vice president of the Association of Alumni/ae, and member of the Annual Fund Board (of which he was a past chair).


S.B. Massachusetts Institute of Technology (1971) J.D., University of Chicago (1975)


Cultural Activities

United States: Antitrust

Civil litigation/class actions

Within: Civil litigation/class actions

Kaplan Fox & Kilsheimer LLP, whose reputation in antitrust dates back more than 40 years, represents plaintiffs in class and non-class private actions. The firm is currently representing a number of large purchasers in private actions concerning price-fixing in the packaged seafood industry and, in 2016, a separate highlight (as co-counsel) involved reaching settlements with the remaining defendants in the Air Cargo Shipping Services Antitrust Litigation. Key partners are Robert Kaplan, Matthew McCahill - Gregory Arenson, Richard Kilsheimer, Elana Katcher and Hae Sung Nam. All named lawyers are based in New York.

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