About MARK

Mark represents businesses and individuals in a wide range of disputes, including complex matters involving contracts, trade secrets, unfair competition, construction claims, and real estate conflicts. He is known for his practical approach to resolving high-stakes litigation while guiding clients through every stage of the process.

Specialties

LITIGATION

BUSINESS LAW

FINANCIAL SERVICES

Admin Contact

Kelly M. DiBonaventure
KDiBonaventure@HRMML.com

Mark Himsworth is Co-Chair of the Firm’s Litigation Department and a seasoned commercial litigator with more than 35 years of experience representing businesses and individuals in complex disputes. Mark’s practice covers a wide range of business and real estate conflicts, and he is known for providing strategic counsel and effective advocacy in high-stakes commercial matters. As Co-Chair of the Litigation Department, he helps lead one of the region’s premier litigation teams while continuing to represent clients in complex business disputes. 

He regularly handles matters involving covenants not to compete, interference with contractual relations, unfair competition, misappropriation of trade secrets, commercial defamation, and partnership or shareholder disputes. In addition, Mark represents clients in construction litigation, including construction defect claims, mechanic’s lien actions, municipal bid challenges, consumer protection claims, and payment and performance bond disputes. He also frequently advocates for residential and commercial brokers in malpractice and commission cases and counsels clients in real estate disputes such as quiet title actions, partition and adverse possession claims, deed restrictions, lis pendens, agreements of sale disputes, and tax assessment appeals. 

Mark is a Fellow of the Litigation Counsel of America, an invitation-only honorary society recognizing fewer than one-half of one percent of American lawyers for excellence in trial advocacy and litigation. He has also been recognized on the Pennsylvania Super Lawyers list for Business Litigation every year from 2010 through 2023—an honor awarded to no more than five percent of attorneys statewide. 

Deeply engaged in both the legal and local communities, Mark serves on the Board of Directors of the Montgomery Bar Association, is a past President of the Montgomery Trial Lawyers, and is an active Barrister with the Montgomery Inn of Courts. He also contributes to civic and nonprofit organizations, currently serving on the Advisory Council of the PennSuburban Chamber of Commerce and having previously served with the Patrician Society, the United Fund of Collegeville-Trappe, and as President and counsel for Big Brothers Big Sisters of Montgomery County. He is also a former member of the Trappe Borough Planning Commission. 

Mark earned his B.A. from the University of Notre Dame in 1984 and his J.D. from Widener University School of Law in 1987.