William J. O'Shaughnessy

Special Counsel

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.


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

Bar Admissions

New Jersey, New York