Gregg Mackuse is a versatile litigator who has prosecuted, defended and monitored complex commercial litigation for more than three decades. With diverse experience, he capably represents businesses, academic institutions, individuals, and government agencies and officials in almost any type of litigation they face. Throughout his extensive career, Gregg has tackled all aspects of litigation, including significant expert discovery, the substantive review and production of millions of pages of documents, and complex fact development involving numerous witnesses and comprehensive motion practice across the United States. Gregg also has conducted internal investigations and analyzed possible corporate misconduct by management and outside professionals. When possible, he has favorably settled matters through mediation.

Health Care Litigation

Gregg is skilled in complex health care fraud litigation. He has served as trial counsel and co-counsel in matters alleging violations of the federal False Claims Act, state Medicaid fraud statutes, state nonprofit laws and state deceptive trade practice statutes.

Representative Experience

  • Co-counsel in proposed class action against health insurance company asserting claims for violation of Pennsylvania Non-Profit Law, breach of contract and breach of fiduciary duty. Pennsylvania Supreme Court reversed intermediate appellate court’s dismissal of action.
  • Representation of two former employees in health care fraud litigation under Federal False Claims Act. The action involved millions of pages of documents, more than 100 fact and expert witnesses, numerous discovery disputes, and extensive motion practice and trial preparation. Following extensive mediation, the matter resulted in substantial settlement.

Pharmaceutical Litigation

Gregg partners with a major pharmaceutical manufacturer in a state court mass tort proceeding involving thousands of personal injury product liability actions. In addition, at both the trial court and appellate levels, Gregg has handled the defense of statutory claims brought by individual states and third-party payors alleging state Medicaid fraud, violations of state deceptive trade practice statutes and violations of the federal RICO statute.

Insurance Litigation

Gregg has represented state insurance commissioners as statutory receivers for insolvent insurers in multistate litigation. These representations have included conducting internal investigation of corporate records and employees, preparing detailed legal analyses concerning proposed litigation and pursuing recovery of assets on behalf of insolvent insurers. Gregg also has successfully litigated numerous complex insurance recovery matters. As a result, Gregg has strategically handled a wide range of insurance matters involving:

  • Managing general agent, broker and investment adviser liability
  • Lender liability
  • Professional liability and fraudulent conveyances
  • Underwriting
  • Primary and excess coverage
  • Actuarial services
  • Claims handling
  • Reinsurance recovery


Bar Admissions

New Jersey

Court Admissions

New Jersey Supreme Court
Pennsylvania Supreme Court
U.S. Supreme Court
U.S. District Court for the Middle District of Pennsylvania
U.S. Court of Appeals for the Second Circuit
U.S. Court of Appeals for the Third Circuit
U.S. Court of Appeals for the Sixth Circuit
U.S. District Court for the Eastern District of Pennsylvania
U.S. District Court for the District of New Jersey
U.S. District Court for the Western District of Pennsylvania


Villanova University School of Law
J.D. cum laude, Order of the Coif (1988)

University of Pennsylvania

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