Michael L. Detweiler: Lawyer with Marshall Dennehey Warner Coleman & Goggin, P.C.

Michael L. Detweiler

Michael L. Detweiler is a shareholder with Marshall, Dennehey, Warner, Coleman & Goggin in the firm's Casualty Department. Michael has experience defending a wide array of cases, including products liability, construction litigation, municipal liability, premises liability, contractual claims, motor vehicle, and other personal injury cases.
Phone(215) 575-2810

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Experience & Credentials

Practice Areas

  • Professional Liability
  • Construction Injury Litigation
  • Municipal Liability
  • Construction Defects
  • Product Liability
University Dickinson College, B.A., magna cum laude, 1998 Honors: Sigma Iota Rho
Law SchoolBoston College Law School, Newton, Massachusetts, J.D., International Studies / History, 2002
Admitted2002, Massachusetts; 2003, New Jersey; 2003, Pennsylvania; 2003, U.S. District Court Eastern District of Pennsylvania

Associations & Memberships

•Pennsylvania Bar Association
•Philadelphia Bar Association
•Board Member, Saint Mary Interparochial School


Michael is a member of the Professional Liability Department where he has successfully defended clients in numerous professional liability and casualty matters. Michael's past and present clients include construction companies, tour operators, travel agents, resorts, local municipalities, governmental transportation agencies, medical device manufacturers, and numerous other individuals and entities. He has also successfully defended entities and individuals in commercial and breach of contract disputes.

In his career, Michael has obtained numerous defense verdicts and summary judgments in the state and federal courts of Pennsylvania and New Jersey. His extensive experience with both professional liability and casualty matters provide an invaluable advantage in representing clients in those matters which require a firm grasp of both practice backgrounds.

Prior to joining Marshall Dennehey, Michael was Assistant City Solicitor with the City of Philadelphia Law Department for two years. He defended police officers, corrections officers and various City of Philadelphia employees and agencies in civil lawsuits.

Michael graduated magna cum laude from Dickinson College in 1998 and from Boston College Law School in 2002. He is licensed to practice in Pennsylvania, New Jersey and Massachusetts.

Classes/Seminars Taught

Legal Issues for Internet Travel Sellers and Travel Insurance for Industry and Consumers, Pennsylvania Bar Institute (PBI) Travel Law Seminar, Philadelphia, May 1, 2014

Insurance Agents and Brokers Best Claims Practices in Claims Administration and Underwriting, Liberty Mutual Insurance, December 2013

Published Works

• Top Legal Considerations for Independent Contractors, Travel Agent magazine, September 2014

• The Motor Vehicle Black Box, Dispute Resolution Institute: Annual Personal Injury Potpourri 2007, Co-Authored with Ralph P. Bocchino, Esq.


Travel Law Seminar May 1, 2014

Michael Detweiler, shareholder in our Professional Liability Department, will be a featured speaker at the PBI Travel Law seminar, to be held May 1 in Philadelphia. Michael and other panelists will discuss hot topics in the field of travel law,...


Attorney Cites Considerations for Agents Operating as Independent Contractors Articles September 1, 2014

Major Victories

Costa Rica Tour Operator Dismissed from Litigation

Honors & Awards

•Pennsylvania Super Lawyer Rising Star, 2007-2008, 2010-2015

Year Joined Organization


Reported CasesSignificant Representative Matters: Successfully drafted and argued Motion for Judgment on the Pleadings on behalf of international tour operator in a federal court case in which plaintiff (a 35 year old man) drowned while on a fishing excursion near the coast of Costa Rica. (The fishing excursion was booked through the tour operator). The underlying motion was predicated on applicable tour operator liability law, maritime law, and the Death on the High Seas Act; Served as lead trial counsel and successfully obtained a compulsory non-suit, for construction subcontractor client, in a three week trial in the Philadelphia County Court of Common Pleas. Plaintiff alleged that he suffered a significant arm injury and resulting brachial plexopathy as the result of an injury at the underlying construction site. Plaintiff alleged that he suffers debilitating pain and that he is permanently disabled. His economist estimated his life care plan, lost past earnings, and loss of future earning capacity, to be in excess of $6 million; Successfully drafted Motion to Dismiss on jurisdictional grounds on behalf of internationally renowned California golf resort that was sued by plaintiff for severe head and cognitive injuries; Obtained voluntary dismissal of all claims as to tour operator sued by plaintiff for personal injuries as a result of alleged injuries stemming from an accident in a resort in Jamaica; Obtained voluntary dismissal of all breach of contract claims as to local non-profit financial institution in a breach of contract civil action involving close to $1 million in disputed monies; Obtained numerous defense verdicts as lead trial counsel on behalf of clients in federal court in which plaintiff alleged false arrest, excessive force, and other civil rights violations; Obtained multiple summary judgments on behalf of clients in general casualty and products liability matters.; Published Works: Top Legal Considerations for Independent Contractors, Travel Agent magazine, September 2014; The Motor Vehicle Black Box, Dispute Resolution Institute: Annual Personal Injury Potpourri 2007, Co-Authored with Ralph P. Bocchino, Esq.
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Office Information

Michael L. Detweiler

2000 Market Street, Suite 2300
PhiladelphiaPA 19103


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