Matthew D. Monsour Partner

Matthew is an experienced, high-stakes complex commercial litigator at both the trial and appellate level for some of the country’s top corporations. His representation focuses on the technology, transportation and financial services industries. He currently represents and advises leading technology platforms in litigation and compliance matters nationwide.

Matthew has tried cases in federal and state court and has briefed and/or argued appeals in the U.S. Court of Appeals for the Third, Sixth, and Eleventh Circuits, as well as in state appellate courts through the country. His results include striking down laws under the Equal Protection and Due Process Clauses of the U.S. Constitution, and upholding companies’ unique business models against tort and statutory based claims. 

Leveraging that background, Matthew has a particular specialty in helping companies efficiently and effectively defend against recurring and business-sensitive litigation across jurisdictions.  His national coordinating counsel experience spans Fortune 50 corporations and gig economy companies. Through these representations, Matthew has developed expertise in strategically protecting clients’ independent contractor designations and enforcing online terms and conditions, including through motions to compel arbitration. 

Matthew has a strong commitment to pro bono, civic, and philanthropic endeavors. He focuses those efforts on animal welfare. He regularly represents animal rescues and sanctuaries in Pennsylvania and beyond. He has taken action both to ensure the viability of non-profit rescues and to defend rescues from unlawful regulation that would shut them down. He has served as special prosecutor on behalf of Animal Friends and has advised humane enforcement officers in all aspects related to the search, seizure, and protection of abused and neglected animals. He regularly negotiates with local governments to ensure the humane treatment of recovered animals and feral cat colonies. He is Vice President of the Board of Animal Friends and Co-Chair of its Legal Committee.

Prior to joining McGuireWoods, Matthew worked at a large New York-based law firm, studied at the Imperial College in London and clerked for the Hon. Kate Ford Elliot, President Judge of the Pennsylvania Superior Court.


National Coordinating Counsel for technology platform leading litigation on issues of first impression across the country involving status of platform users and enforcement of online terms and conditions including compelling arbitration.

National Coordinating Counsel for Fortune 50 transportation company defending against tort-based claims attacking independent contractor business model.

Representation of banking institutions in complex statutory and fraud cases in federal district court and appellate courts throughout the country.

First-chaired and won six-day federal trial that invalidated law under the Equal Protection Clause of the U.S. Constitution and resulted in a six-figure damages award and a six-figure attorneys’ fees’ recovery for client.

Argued and briefed constitutional issue of first impression in the 3rd U.S. Circuit Court of Appeals resulting in a split-decision on the issue.

Defense of pharmaceutical company in dispute over the right to sell and market drug under the Lanham Act securing dismissal in federal court.

Defense of international client in a contract dispute with former employee for interest in a multimillion-dollar business securing dismissal in federal court. Unanimously affirmed by the 6th U.S. Circuit Court of Appeals in published opinion.

Argued, briefed, and won judgment invalidating significant criminal fine levied against client as violative of the Due Process Clause of the U.S. Constitution

Argued, briefed and won takings claim on behalf of corporate client under the U.S. Constitution

Representation of financial institution related to high-profile data security breach

Argued, briefed and won novel zoning case involving non-profit large breed dog rescue on appeal in published opinion from the Pennsylvania Commonwealth Court in matter that garnered wide-spread publicity, including articles in the USA Today, Wall Street Journal, the Tribune Review, and the front page of the Pittsburgh Post-Gazette. 

First-chaired and won judgment in favor of non-profit in first case proceeding under new recovery statute in Allegheny County, Pennsylvania

  • Duquesne University School of Law, JD, Executive Articles Editor, Duquesne Law Review, 2008
  • University of Pittsburgh, BA, English Literature, magna cum laude, 2005

Vice President of the Board of Directors, Animal Friends

  • Speaker, "Hiring, Managing and Collaborating with Outside Counsel," CCBJ Legal Operations Executive Leadership Forum, March 5, 2020
  • Panelist, "Fitting Fido into Public Places," Allegheny County Bar Association, April 3, 2018
  • Lecturer, "Libre’s Law," Duquesne University School of Law, November 4, 2017
  • Lecturer, "The Pennsylvania Cost of Care Statute," Duquesne University School of Law, October 22, 2016
  • Lecturer, "Law and Statutes Involving Animal Rescues," Duquesne University School of Law, November 14, 2015
  • Lecturer, "First Amendment in Public Schools," Seton Hill University, 2014 and 2015
  • Panelist, Companion Animals and the Law, Duquesne University School of Law, November 8, 2014
  • Pennsylvania
  • U.S. Court of Appeals for the 3rd Circuit
  • U.S. District Court for the Western District of Pennsylvania

Selected for inclusion in “Legal 500 United States,” Transport: Rail and Road – Litigation and Regulation, 2021

McGuireWoods Excellence Award Winner

McGuireWoods Pro Bono Award Winner

Named to "Pennsylvania Rising Stars," Business Litigation, Super Lawyers, Thomson Reuters, 2014, 2015, 2016, 2017, 2018

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