Barry L. Refsin represents clients in complex commercial litigation including antitrust, software licensing disputes, and intellectual property litigation.

He has represented some of the country’s largest chain drug stores as plaintiffs in a variety of antitrust cases challenging pricing and exclusionary practices of brand name pharmaceutical manufacturers. Mr. Refsin also frequently represents technology companies in licensing and patent disputes.

Honors & Awards


Ranked in Chambers USA for Pennsylvania: Antitrust, 2021 – 2023

Listed in Benchmark Litigation as a Litigation Star, 2024

Listed in Pennsylvania Super Lawyers for Antitrust Litigation, 2005,  2018 – present

University of Pennsylvania Law Review, Executive Editor, 1990 – 1991

University of Pennsylvania Law Review, Associate Editor, 1989 – 1990


“Proving Market Power in Patent Tying Cases After Illinois Tool Works,” Intellectual Property Supplement, The Legal Intelligencer, May 2006

“Antitrust Concern in B2B Exchanges,” Business to Business Internet Exchanges, Aspen, 2002