1133 Avenue of the Americas
New York, NY 10036

+1 212 336 2793

Local Litigation Star

National Practice Area Star

Practice area:

Intellectual property

William Cavanaugh is a Senior Litigation Partner and served as Co-Chair of the Firm from 2007 to 2017. His areas of concentration include antitrust, intellectual property and commercial litigation. 

A skilled trial attorney with extensive experience in both state and federal courts as well as in arbitrations, Mr. Cavanaugh has served as national and trial counsel in many large multiparty antitrust, fraud, RICO and consumer protection litigations in federal and state courts across the United States brought by private class action plaintiffs and State Attorneys General. His clients include major pharmaceutical, medical device and financial services companies. Mr. Cavanaugh also served as Deputy Assistant Attorney General of the United States for Civil Enforcement in the Antitrust Division of the Department of Justice in the beginning of the Obama Administration. Mr. Cavanaugh’s trial experience includes securing defense verdicts in a multibillion-dollar antitrust class action, civil fraud class actions, and representing both plaintiffs and defendants in patent trials involving medical devices and pharmaceuticals, including having successfully tried a number of Hatch-Waxman patent cases. He has also represented a number of major health care companies in arbitrated contract disputes, and has argued over two dozen appeals in appellate courts across the country 

Mr. Cavanaugh is an elected Fellow of the American College of Trial Lawyers. He has been listed in The Best Lawyers in America® for Antitrust Law and Commercial Litigation as well as in Who’s Who Legal in Litigation. Chambers USA has recognized him in the area of Intellectual Property: Patent. 

Mr. Cavanaugh graduated from St. John’s University School of Law in 1980. 


Updated Sep 2021