Dennis Callahan


Philadelphia (West), PA
D 215 836.1881


Syracuse University College of Law, J.D., magna cum laude

Cornell University, B.S.


Dennis Callahan is a Partner and Office Co-Chair of Freeman Mathis & Gary's Philadelphia office. He is also Vice-Chair of the firm's On Call Trial team.

Over the course of his 30-year career, Mr. Callahan has tried a wide variety of cases to verdict, including complex contract claims, business torts, and catastrophic personal injury matters. Having studied engineering and worked in a manufacturing environment before embarking on his law career, Mr. Callahan applies a methodical and structured approach to his practice. He has a special interest in matters involving technical or scientific issues—such as products liability and transportation matters—where he can leverage his engineering experience for the benefit of his clients. Mr. Callahan is often called into matters to prepare and present technical experts for deposition and trial, and to cross-examine experts presented by the opposition. Mr. Callahan has been recognized by Best Lawyers since 2016. 

In his spare time, Mr. Callahan enjoys travel, section-hiking the Appalachian Trail, Python coding, and Philadelphia sports.

Bar Admissions

New Jersey


U.S. Court of Appeals, Third Circuit

U.S. District Court, District of New Jersey

United States District Court for the District of Colorado

United States District Court for the Eastern District of Pennsylvania

United States District Court for the Middle District of Pennsylvania 

United States District Court for the Western District of Pennsylvania

Publications & Engagements

Tort Law Desk Reference: A Fifty State Compendium. Wolters Kluwer. (Pennsylvania Contributing Editor)
Business Torts: A Fifty-State Guide. Wolters Kluwer. (New Jersey Contributing Editor)


Defense Research Institute

American Bar Association

Awards and Recognition

Selected to The Best Lawyers in America® – Personal Injury Litigation – Defendants
Selected to Pennsylvania Super Lawyers