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Jack L. Gruenstein

Of Counsel
Chair, White Collar Crime Practice Group
2000 Market Street, Suite 2300
Philadelphia, PA 19103
(215) 575-2768
(215) 575-0856 - Fax

As special counsel to Marshall Dennehey Warner Coleman & Goggin, Jack leads the firm's white collar defense practice and assists our health care, privacy and professional liability clients with responses to government audits, grand jury and regulatory investigations and prosecutions. Jack also can assist our clients in conducting internal investigations.

As a trial lawyer, Jack has handled more than 50 criminal and civil jury trials and a substantial number of non-jury cases. He has represented many corporate employees and officers, as well as physicians in state and federal courts.

Jack handles complex matters. In one instance, he represented a client who was owed substantial fees by an insurance company that was placed into rehabilitation and then liquidated by the Pennsylvania Insurance Commissioner. After protracted litigation in the Commonwealth Court of Pennsylvania, the matter was resolved in favor of Jack’s client.

Jack attended Temple University in Philadelphia, Pennsylvania, where in 1973 he earned his Bachelor of Arts, cum laude. He then went on to earn his juris doctor from Temple University School of Law in 1976, also graduating cum laude. While in law school, Jack was a member of the Temple Law Review.

Following graduation from law school, Jack was a trial attorney for three years with the Bureau of Investigations and Enforcement of the Interstate Commerce Commission. During this period, Jack brought various enforcement actions against individuals and companies involved in the surface transportation industry. Jack then worked for two years as an associate with a prominent civil and criminal litigation firm in Philadelphia, Pennsylvania, after which he established a successful civil and criminal practice that he operated as a sole practitioner for almost 20 years. Jack left solo practice to become a partner in the white collar criminal boutique firm and, after more than eight years, left to join our firm. 

Jack is currently a member of the America Israel Public Affairs Committee and its Philadelphia area Leadership Council. He is also a member of the Pennsylvania Criminal Defense Lawyers. Jack has also been awarded an AV® Preeminent™ by Martindale-Hubbell, which identifies the fact that a lawyer's peers rank him or her at the highest level of professional excellence. 

Significant Representative Matters

  • United States v. Rooney - Successfully defended an AFSCME District Council Vice President accused of embezzlement from a union hospital in a multiple-defendant, six-week trial resulting in the only acquittal in the case.

  • State v. Grossberg, a Delaware case involving the death of an infant.

  • Bass v. County of Wayne, et. al. - In this malicious prosecution/civil rights case in Detroit, Michigan, was part of the trial team that obtained the then highest damages award to date awarded by a Michigan jury.

  • Wright v. PHA – A jury verdict was obtained in a reverse-discrimination civil rights suit on behalf of an employee of the Philadelphia Housing Authority.

  • Commonwealth v. Eric Grier – represented a defendant accused of first degree murder and conspiracy to murder and whose death sentence was reversed by the Pennsylvania Supreme Court because of an improper instruction on accomplice liability for the crime of first degree murder.  As a result of the reversal, the proper standard of accomplice liability for first degree murder was clarified.

  • Successfully represented a physician during an investigation by the Nuclear Regulatory Commission, and committees of the United States Senate and the United States House of Representatives, into the administering of prostate cancer radiation therapy at the Philadelphia Veterans Administration Medical Center.

  • Successfully represented a physician in a civil investigation by the United States Attorney for the Eastern District of Pennsylvania and the Food and Drug Administration into the off-label use of a drug manufactured and marketed by a major pharmaceutical house.

  • Represented an orthopedic surgeon who was a witness in a criminal investigation conducted by the United States Attorney for the Eastern District of Pennsylvania into the use of synthetic bone cement alleged to have caused significant medical injuries to patients.

  • Represented an orthopedic surgeon who was a witness in a criminal investigation conducted by the United States Attorney for the District of New Jersey into the payment of kickbacks in return for the use of certain types of orthopedic appliances.

Published Works

  • "Third Circuit Criminal Handbook – 2016 Edition," LexisNexis, Winter 2016

  • "Government Disclosure Obligations in Criminal Cases," The Legal Intelligencer, White Collar Crime Supplement, May 5, 2015

  • "Corporate Bylaws May Provide Unintended Support For Employees," New Jersey Law Journal, March 10, 2014

  • "Moratorium on Death: A Paradigm for Pennsylvania," The Philadelphia Lawyer, Winter, 2003

Past Employment Positions

  • U.S. Air Force, Sergeant, 1966 - 1970

  • Interstate Commerce Commission, Trial Attorney


  • Temple University School of Law, Philadelphia, PA (J.D, 1976)

    Honors: cum laude

  • Temple University, Philadelphia, PA (B.A., 1973)

    Honors: cum laude

Law Alerts April 24, 2013
The United States Attorney's Office for the Northern District of Illinois announced that it has arrested the senior executive of Sacred Heart Hospital in Chicago and four physicians for alleged violations of the Antikickback Act. In addition,...
Defense Digest Article December 1, 2012
  Key Points: Increased number of I-9 audits leave employers exposed to civil and criminal liability. I-9 paperwork itself scrutinized and can lead to significant fines. I-9..., Defense Digest, Vol. 18, No. 4, December 2012
Defense Digest Article June 1, 2011
As the economy struggles to recover its footing, and as new, costly programs are created, the focus of the government, whether federal, state or local, increasingly has been to pursue both criminal and regulatory investigations with the goals of..., Defense Digest, Vol. 17, No. 2, June 2011


  • Temple University School of Law (J.D., cum laude, 1976)
  • Temple University (B.A., cum laude, 1973)

Bar Admissions

  • Pennsylvania, 1976
  • U.S. District Court Eastern District of Pennsylvania, 1977
  • U.S. Court of Appeals 3rd Circuit, 1978
  • U.S. District Court Western District of Pennsylvania, 1978
  • U.S. District Court Middle District of Pennsylvania, 2006

Associations & Memberships

  • America Israel Public Affairs Committee
  • Federal Bar Association, 1995 - Present, Member, Criminal Law Committee
  • The Philadelphia Leadership Council

Honors & Awards

Year Joined Organization: 2010

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