Marc P. Weingarten

Marc P. Weingarten, Partner

Background and Experience

Marc P. Weingarten joined the Locks Law Firm in 1978 and has been a partner since 1983. Before coming to the firm, he was a law clerk for the Honorable Thomas A. Pitt, Jr., in the Court of Common Pleas, Chester County, Pennsylvania from 1976-1978.

Marc focuses his practice on complex personal injury litigation. He has served as trial counsel in over one hundred jury and non-jury trials. He has represented  plaintiffs in product liability and class action claims involving asbestos, defective pharmaceutical products and devices, flammable fabrics, defective machinery, insurance industry irregularities and more. Marc has served as lead counsel in numerous asbestos property damage claims, including those involving Adams-Arapahoe County Board of Education (Colorado), Baltimore County and Baltimore County Board of Education (Maryland), Anne Arundel County Board of Education and Anne Arundel County (Maryland), the School District of Philadelphia (Pennsylvania), the Chicago Board of Education (Illinois), and the Commonwealth of Kentucky.  Marc tried the first successful property damage claims against manufacturers of asbestos pipe and boiler insulation materials and vinyl asbestos floor tile.

Throughout his career, Marc has been active in donating his time to pro bono activities. He is an accomplished lecturer and has published extensively on the subject of complex litigation with an emphasis on asbestos and trial techniques. Marc has published over 50 articles in various journals, including a chapter in a book on Asbestos Diseases. In addition, he has given lectures at or chaired over sixty seminars and conferences throughout the United States, Europe and the United Kingdom.

Marc is on the Board of Governors of the American Association For Justice and has been elected a Pennsylvania Super Lawyer in the area of product liability every year continuously since 2005. He has been certified by the National Board of Trial Advocacy as a civil trial specialist since 1988 and was elected to the American Law Institute in 2003.

Outside the Office

Marc is an avid tennis player and plays the game year round. He is finally getting pretty good. He is also a trivia lover, with specialties in TV, movies and rock and roll. He has unsuccessfully auditioned for Jeopardy four times and has lost track of how many times he saw The Ramones in concert. He has a beautiful wife, four wonderful sons and four tiny grandchildren.

Blog Posts

Public Appearances

Mandatory Videotaping of Asbestos Trials, Fourth Annual Asbestos Litigation Seminar, Monterey, California, May 13-15, 1988.

Asbestos Litigation in the United States, The Essential Occupational Health Update Conference, College of Personal Injury Law, London, England, October 3, 2000.

Enter Laughing: Humor As An Effective Tool For Lawyers, Chair and Lecturer, LightStream Communications, Ardmore, Pennsylvania, June 6, 2006 (CLE program.).

Cross Border Cases: From Beginning To End, PEOPIL 15th Annual Conference, Personal Injury: The Way Forward In Europe, Berlin, Germany, September 14, 2012.

Reinstatements, Hearing Committee Training Session, The Disciplinary Board Of The Supreme Court Of Pennsylvania, Hershey, Pennsylvania, October 14, 2016. 


Weingarten, "Trial Proof in a Mesothelioma Case," Source Book on Asbestos Diseases: Medical, Legal, and Technical Aspects, Volume 13, Asbestos Pathogenesis and Litigation, (1996).

Weingarten and Ebert, “Shoulder Pain Pump Litigation,” The Prairie Barrister, Nebraska Association of Trial Attorneys, Vol. 17, No. 3 (Fall, 2011).

Weingarten and Jimenez, “Pennsylvania Strict Liability Law In A State Of Flux,” The Legal Intelligencer, Litigation: Personal Injury Special Section (November 20, 2012).

Weingarten, “The Oscars: Teachable Moments For Lawyers”, Philadelphia Business Journal (online edition) February 25, 2016.

Weingarten, “40 Years Later, Lessons of Legionnaires’ Outbreak,” Editorial, The Philadelphia Inquirer (July 21, 2016). (Second Publication in Trial Talk, Colorado Trial Lawyers Association, Vol. 66, No. 1 (December/January 2017)).

Martindale-Hubbell 2015 AV Rating

Admitted to Practice

Pennsylvania (1976)
New York (1987)
Kentucky (1988)
United States Supreme Court (1983)
United States Courts of Appeals,
3rd Circuit (1981),
2nd and 10th Circuits (1988),
6th Circuit (1996)
United States District Court for the Eastern District of Pennsylvania (1979)
Middle District of Pennsylvania (1991)
Eastern and Western Districts of Kentucky (1994)
Western District of Pennsylvania (2011)
Southern and Eastern Districts of New York (2013)


Temple University, B.A., magna cum laude, 1973
Villanova University School of Law, J.D., 1976

Professional Affiliations

American Inns of Court – Master College of Master Advocates and Barristers – Senior Counsel
International Academy of Litigators – Diplomat
American Association for Justice
Pennsylvania Association for Justice
Philadelphia Trial Lawyers Association
Association of Personal Injury Lawyers (England)
Pan European Organization of Personal Injury Lawyers

Board Affiliations and Appointments

Philadelphia Trial Lawyers Association – Comptroller, Board of Directors Pennsylvania Trial Lawyers Association/ Pennsylvania Association for Justice – Board of Governors Association of Trial Lawyers of America/ American Association for Justice Student Trial Advocacy Competition – Regional Coordinator (1999, 2000) International Practice Section – Co-chair, Vice-chair, Education Coordinator International Relations Committee, 1999 - present Mediator/Arbitrator for the United States District Court for the Eastern District of Pennsylvania (1992-present) Mediator/Arbitrator for the Philadelphia County Court of Common Pleas (1978-present) Settlement Master/ Judge Pro Tempore for the Philadelphia County Court of Common Pleas (1992-present) American Bar Association, Committee on Toxic and Hazardous Substances and Environmental Law – Vice-chair Disciplinary Board of the Supreme Court of Pennsylvania Hearing Committee 1.07 – Member (1995 - 1997), Chairman (1997-2000) *Senior Hearing Committee Member (2005 – present)International Relations Committee, AAJ, Public Affairs Committee, AAJ, Board of Governors, AAJ


Kentucky Bar Association Continuing Legal Education Recognition Award
National Board of Trial Advocacy, Certified Trial Specialist
Pennsylvania Super Lawyer® – Plaintiff Personal Injury
National College of Advocacy, Advocate–Million Dollar Advocates Forum
American Law Institute, elected to membership
National Board of Pre-Trial Practice Advocacy, Board Certified
Pro Bono Service Award, Philadelphia Court of Common Pleas
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