Gregg W. Mackuse

Senior Counsel


Gregg Mackuse is a seasoned litigator with more than 30 years of experience based on a simple philosophy: never litigate without a plan. Gregg’s experience includes litigation across the United States, for and against federal and state entities, and for and against corporations, while he was a partner in both a boutique firm and full-service firm. He prides himself on being a lawyer who will work personally on every aspect of a case from the beginning until the end.

State Attorneys General Litigation

For more than a decade, one of the primary focuses of Gregg’s practice has been the defense of pharmaceutical and automotive manufacturers in numerous jurisdictions in connection with actions brought by state attorneys general alleging violations of deceptive trade practice and Medicaid fraud statutes as well as common law claims. Such actions require focused knowledge and skill as they involve substantial potential exposure due to expansive statutes and novel theories that can threaten massive civil penalties and damages. In successfully defending and resolving such actions, Gregg has served as counsel in all aspects of the cases, including at both the trial court and appellate levels. Gregg also is one of the leaders of the firm’s state attorneys general practice group.

Mass Tort Pharmaceutical Litigation

Gregg also has extensive experience in the defense of state court mass tort proceedings involving thousands of individual personal-injury product liability suits brought against a major pharmaceutical manufacturer. Mass tort proceedings also involve substantial potential liability and require skilled advocacy to reduce a company’s potential exposure. In the defense of the mass torts, Gregg has had primary responsibility for all aspects of motion practice from inception of the cases through discovery as well as trial.

Health Care and Insurance Litigation

Gregg is skilled in complex health care fraud litigation alleging violations of the Federal False Claims Act. He also has represented state insurance commissioners as statutory receivers for insolvent insurers in multistate litigation, representations which included conducting internal investigations of corporate records and employees, preparing detailed legal analyses concerning proposed litigation, and pursuing recovery of assets on behalf of insolvent insurers. Gregg similarly has successfully litigated numerous complex insurance recovery matters.


Bar Admissions

New Jersey

Court Admissions

U.S. Supreme Court
New Jersey Supreme Court
Pennsylvania Supreme Court
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 District of New Jersey
U.S. District Court for the Eastern District of Pennsylvania
U.S. District Court for the Middle District of Pennsylvania


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

University of Pennsylvania

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