Thomas L. Allen Photo
Tom has more than 25 years' experience representing business clients in complex litigation, including securities, antitrust, intellectual property, consumer finance, business fraud and other commercial cases.  Tom has been lead defense counsel in numerous jury trials.  He has spearheaded the defense of more than 75 class actions in courts throughout the United States and is familiar with all aspects of class action practice.  Tom has been defense counsel in three jury trials of certified class actions that went to verdict; two resulted in defense verdicts, and the plaintiffs' verdict in the third case was reversed on appeal.  Tom also has extensive experience in coordinating the defense of multiple cases pending simultaneously in different courts, and the defense of parallel civil and criminal matters.


  • University of North Carolina School of Law, 1980, J.D., Law, Articles Editor of the North Carolina Law Review
  • University of Michigan, 1977, B.A., History

  • Kalifornien
  • Pennsylvania

  • U.S. Supreme Court
  • State Supreme Court - Pennsylvania
  • State Supreme Court - California
  • U.S. District Court - Western District of Pennsylvania
  • U.S. Court of Appeals - Third Circuit
  • U.S. Court of Appeals - Fourth Circuit
  • U.S. Court of Appeals - Fifth Circuit
  • U.S. Court of Appeals - Sixth Circuit
  • U.S. Court of Appeals - Seventh Circuit
  • U.S. Court of Appeals - Eighth Circuit
  • U.S. Court of Appeals - Ninth Circuit
  • U.S. Court of Appeals - Eleventh Circuit

  • Allegheny County Bar Association – Member and former Chair, Federal Court Section; former Chair, Antitrust and Class Action Committee
  • American Bar Association – Member of Sections of Antitrust, Business Law and Litigation
  • Pennsylvania Bar Association – Member of Sections of Business Law and Litigation
  • State Bar of California – Member of Section of Litigation
  • U.S. District Court for the Western District of Pennsylvania – Member, Committee on Local Rules
  • University of Pittsburgh Law School – Lecturer on Antitrust Law, Corporate Counsel Clinic (1992–1999)
  • University of Pittsburgh Law School – Adjunct Professor of Law
    Teaching courses in Complex Litigation (Winter 1998, Fall 2000, Winter 2002) and Antitrust (Winter 1996)
  • University of Pittsburgh, Katz School of Business – Lecturer on Antitrust Law (1990–1992)


  • Selected through peer review for inclusion in The Best Lawyers in America© for Antitrust Law, Bet-the-Company Litigation, and Commercial Litigation, 2007-2022. He also received the Best Lawyers™ 2013 Bet-the-Company Litigation and the 2016 and 2022 Antitrust Law "Lawyer of the Year" awards in Pittsburgh.
  • Listed in Pennsylvania Super Lawyers for many years in the practice area of Class Action/Mass Torts.