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Timothy J. McMahon

100 Corporate Center Drive
Suite 201
Camp Hill, PA 17011
(717) 651-3505
(717) 651-3707 - Fax

Tim has developed significant experience in defense of multiple litigation areas, including trucking and transportation litigation, professional liability, liquor liability and products liability. He has represented a substantial number of commercial trucking companies, as well as owner operators.

For more than 15 years, Tim has represented a national provider of physical therapy and rehabilitation in cases ranging from class actions to in-patient, out-patient, and ambulatory surgery care. With 20 years experience in defending product liability litigation representing major manufacturers, Tim has also represented specialty manufacturers of both industrial and consumer products.

Tim is a graduate of Richard Stockton College. He attended the Dickinson School of Law where he received his juris doctor in 1988. Tim began his career with Marshall Dennehey Warner Coleman & Goggin in 1987 as a law clerk.

Tim has been named a Pennsylvania Super Lawyer for 2005-2006, 2009, 2011-2017 in the area of Civil Litigation Defense.

Significant Representative Matters

  • Represented a subcontractor in a dispute concerning the design specifications and construction methods used in building a multi-level parking facility. In that context, engaged an expert architect and successfully defended the work performed by the subcontractor client.

  • Successfully defended through trial a product liability action involving catastrophic head injuries sustained by a 5-year-old child where potential exposure was in excess of $5 million.

  • Successfully resolved a multi-party, complex legal malpractice action involving more than 10 years of underlying litigation over a family trust with a gross value in excess of $10 million.

  • Tried to defense verdict, after a six-week jury trial, an action involving a quadriplegic, persistent vegetative state plaintiff in a multi-party medical malpractice matter.

Classes/Seminars Taught

  • "Pennsylvania UM/UIM Update 2016", PBI 22nd Annual Auto Law Seminar Webinar, October 28, 2016

  • Taking and Defending Depositions, Pennsylvania Bar Institute, November 2015

  • Legal Malpractice Avoidance, Lancaster County Bench/Bar Conference, September 2008

Published Works

  • "Practical Applications of Social Media In and Out of the Courtroom," The Pennsylvania Bar Association Quarterly, April 2017

  • "New Obligations When Paying Settlements, Verdicts or Awards: Child Support Obligations and Senate Bill 1205," Defense Digest, Vol. 12, No. 4, December 2006

  • "Negligent Spoliation of Evidence: A New Tort?" Defense Digest, December 1995

  • "Spoliation of Evidence," Pennsylvania Law Weekly, April 1997


  • Dickinson School of Law, Penn State University, Carlisle, PA (J.D., 1988)

  • Stockton State College, Galloway, NJ (B.A., 1984)

Defense Digest Article December 1, 2015
By Timothy J. McMahon, Esq.* More than 30 years ago, Marshall Dennehey began serving the firm’s clients in central Pennsylvania from our Harrisburg office, which currently has over 20 attorneys, including 11 shareholders. Consistent with our..., Defense Digest, Vol 21, No. 4, December 2015 Defense Digest is prepared by Marshall Dennehey Warner Coleman & Goggin to provide information on recent legal developments of interest to our readers. This publication is not intended to provide...
Defense Digest Article December 1, 2014
By Timothy J. McMahon, Esq.* The Trucking & Transportation Liability Practice Group is composed of attorneys concentrating in the representation of clients and their insurers in complex tort and coverage litigation involving all types of common..., Defense Digest, Vol. 20, No. 4, December 2014 Defense Digest is prepared by Marshall Dennehey Warner Coleman & Goggin to provide information on recent legal developments of interest to our readers. This publication is not intended to provide...
Defense Digest Article December 1, 2010
Marshall, Dennehey has had an office in Harrisburg for over 20 years. The Harrisburg office has grown consistently with the growth of the firm and the expanding number of clients we serve. The office moved six years ago from a downtown location to a..., Defense Digest, Vol. 16, No. 4, December 2010
May 11, 2018
After being blinded in one eye by a defective product purchased through the retailer’s marketplace (but manufactured, sold and shipped by a non-party vendor), the plaintiff sued the retailer on multiple theories, including strict liability....
October 2, 2017
Marshall Dennehey Warner Coleman & Goggin's Harrisburg office has been named a "Top Law  Firm For Women" by the Central Penn Business Journal, ranking #8 out of the region's top 25 law firms. Announced in August 2017, the recognition is based on the number and percentage of women lawyers in the...
August 15, 2016
Two Marshall Dennehey attorneys have been selected by Best Lawyers in America© as 2017 "Lawyers of the Year" for specific practice and demographic areas. Timothy J. McMahon, Esquire, shareholder and managing attorney of the Harrisburg office of Marshall Dennehey Warner Coleman & Goggin, has...
October 28, 2013
Marshall Dennehey has relocated its Harrisburg, Pennsylvania, office to new office space in Camp Hill. Effective today, the new office address is 100 Corporate Center Drive, Suite 201, Camp Hill, PA 17911. All telephone numbers remain the same, with the exception of a new office fax number: 717-651...


  • Dickinson School of Law, Penn State University (J.D., 1988)
  • Stockton State College (B.A., 1984)

Bar Admissions

  • Pennsylvania, 1988

Associations & Memberships

  • Cumberland County Bar Association
  • Defense Research Institute
  • Pennsylvania Bar Association, Member, Committee on Professional Liability
  • Pennsylvania Defense Institute

Honors & Awards

Year Joined Organization: 1987

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