Thomas M. Gallagher

Thomas M. Gallagher


Philadelphia, PA
Phone: 215.981.4068    Fax: 215.981.4750

"He is very good at managing difficult relationships in emotionally charged situations." - Chambers USA 2015

Thomas M. Gallagher is chair of the Executive Committee of Pepper Hamilton LLP. He also is a partner in and chair of the firm’s White Collar Litigation and Investigations Practice Group. Mr. Gallagher represents clients in white collar criminal matters, corporate investigations and complex civil litigation.

Mr. Gallagher’s national practice is focused on representing entities facing government investigations particularly focused in the health care industry. He also represents businesses and individuals facing investigation by federal and state law enforcement authorities, government regulatory agencies and congressional committees. For example, he has represented major pharmaceutical companies, medical device manufacturers, payors, providers, defense contractors and other entities and individuals in parallel federal criminal, civil and state attorney general investigations, as well as Foreign Corrupt Practices Act and antitrust investigations.

Mr. Gallagher is a frequent author and regular speaker at seminars and conferences.

Mr. Gallagher is a former prosecutor in the criminal division of the U.S. Attorney’s Office in the Eastern District of Pennsylvania. He has led the investigation and prosecution of numerous complex, multi-defendant white collar criminal matters in a number of industries, including health care, insurance, financial services and defense.

Before he joined the U.S. Attorney’s Office in 1995, Mr. Gallagher served for six years as a trial lawyer and staff judge advocate for the U.S. Navy and, before that, served as a line officer on a destroyer. He retired as a Captain in the U.S. Naval Reserve, Judge Advocate General’s Corps.


  • J.D., cum laude, Villanova University School of Law, 1989, Editor-in-Chief, Villanova Law Review
  • B.A., International Relations, University of Pennsylvania, 1982

Bar Admissions

  • Pennsylvania

Court Admissions

  • U.S. District Court, Eastern District of Pennsylvania
  • U.S. Court of Appeals, Third Circuit
  • United States Supreme Court

Practice Areas