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Marie-Theres DiFillippo

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Primary Office
1500 Market St., Suite 3500E
Philadelphia, PA 19102
Direct(215) 575-7120
Fax(215) 575-7200


Lori Zimmerman
Direct(215) 575-7097

Marie-Theres DiFillippo concentrates her practice in complex commercial litigation, representing clients in a wide range of industries. She has represented municipalities, government agencies, private universities, public school districts, trade associations, professional practices, health plans, non-profit corporations, and contractors, among others.

Marie’s commercial litigation experience includes both the defense and prosecution of False Claims Act cases, shareholder disputes, statutory discrimination claims, constitutional matters, class actions, business tort cases, IP-related matters, and a variety of breach of contract actions.  In addition, Marie has worked on a variety of white collar investigations and litigation matters, including the prosecution of claims stemming from the theft of proprietary website materials and defending a behavioral health clinic against claims of fraudulent Medicaid billing.  She has also represented multiple health plans and contractors in a series of government bid protests and related Right-to-Know matters, many of which have proceeded before the Commonwealth Court of Pennsylvania.

Marie’s work covers all aspects of litigation, from the initial pleading stage through appellate proceedings, including the prosecution and defense of preliminary injunctions and temporary restraining orders, managing discovery, motion practice, and assisting with settlement negotiations. 

Marie is a graduate of Temple University, Beasley School of Law, where she was a Note & Comment Editor of the Temple International & Comparative Law Journal.  After graduation, Marie served as a law clerk to the Honorable Joel H. Slomsky of the United States District Court for the Eastern District of Pennsylvania.

Representative Experience

  • Defended large public school district against class action lawsuit alleging violations of various anti-discrimination statutes such as the IDEA, Title VI, the EEOA, the ADA, the Rehabilitation Act, and related state laws.
  • Defended and prosecuted claims on behalf of private neurosurgery practice against health system including RICO and Lanham Act violations, unfair trade practices, conversion, breach of contract claims, and breaches of restrictive covenants.
  • Prosecuted false claims matters and direct actions on behalf of various Counties across the Commonwealth of Pennsylvania against national telecommunication service providers to collect unpaid statutory fees meant to fund local emergency 911 systems.
  • Obtained dismissal with prejudice on Motion to Dismiss, and prevailed against two subsequent Motions for Reconsideration, as to claims against a private university by a former graduate student who alleged due process violations, breach of contract, and violations of various anti-discrimination statutes.
  • Serves as a volunteer attorney for the Support Center for Child Advocates, representing children in dependency hearings in Philadelphia’s Family Court.

Professional & Community Activities

  • Member of Board of Governors, Justinian Society
  • Law School Liaison, Justinian Society
  • Member, Philadelphia Bar Association 
  • Temple Law Alumni Association
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Alternate Biographies





  • J.D., cum laude, Temple University James E. Beasley School of Law, Note & Comment Editor, Temple International & Comparative Law Journal, 2013
  • B.A., cum laude, University of Pennsylvania, 2007

Bar Admissions

  • Pennsylvania, 2013
  • New Jersey, 2013