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  • LL.B., University of Virginia School of Law, 1962
  • B.A.E., University of Virginia, 1959

Bar Admissions

  • New Jersey
  • New York

Court Admissions

  • U.S. Courts of Appeals, Second, Third, Tenth and Federal Circuits
  • U.S. Supreme Court

Memberships & Affiliations

American College of Trial Lawyers, Fellow

American Bar Foundation, Fellow

American Law Institute

American Bar Association, Antitrust and Litigation Sections

Disciplinary Review Board of Supreme Court of State of New Jersey, 2001-08, Chairman, 2005-08

William J. O'Shaughnessy

  • |
Special Counsel
  • T: 973.639.2094
    F: 973.297.3722
    • Four Gateway Center
      100 Mulberry St.
      Newark, NJ 07102

Mr. O'Shaughnessy is a trial lawyer, concentrating on complex litigation of all kinds, including antitrust, intellectual property litigation, class action defense, unfair competition and contract disputes. He regularly appears at the trial and appellate levels of the federal and state courts, both in and out of New Jersey, and has been chief counsel in domestic and international arbitrations.

He currently handles or has handled a wide variety of antitrust cases in New Jersey and elsewhere, involving price-fixing, group boycott, monopolization, resale price maintenance and price discrimination claims.

Mr. O'Shaughnessy has been recognized as a New Jersey Super Lawyer since the publication's inception and in The Best Lawyers in America for more than 20 years. He has also been recognized in Chambers USA as a “Senior Statesman” for General Commercial Litigation in New Jersey, and according to sources quoted in Chambers, he is considered "very wise and experienced." Chambers is published by Chambers and Partners. Super Lawyers is published by Thomson Reuters. Best Lawyers is published by Best Lawyers in partnership with US News and World Report. A description of their selection process can be found in the respective links above. No aspect of this advertisement has been approved by the Supreme Court of New Jersey.

Representative Matters

Obtained summary judgment dismissal of a putative class action against an NFL team challenging its personal seat license program for a new stadium.
Co-counsel for NCAA and the major professional sports leagues in obtaining injunctions against implementation of New Jersey’s Sports Wagering Law in violation of the Federal Professional and Amateur Sports Protection Act.
Co-counsel in defending biopharmaceutical companies in three separate “pay for delay” class actions arising set of settlements of Hatch-Waxman patent infringement actions.
Successfully defended two partners of major law firms against charges of federal RICO violations and conspiracy to defame an electronics distributor.
Extensive experience, as co-counsel, in representing brand pharmaceutical companies in all aspects of Hatch-Waxman patent infringement litigation.