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Marc Denis Haefner

Antitrust and trade law Attorney at Newark, NJ

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About Marc

Learn Marc’s areas of practice.

Marc D. Haefner represents clients in a wide range of complex commercial and intellectual property litigation. As a commercial litigator, he focuses on civil cases arising under the Racketeer Influenced and Corrupt Organizations Act (RICO), and has both successfully prosecuted and defended such cases. He has also defended numerous class actions brought under New Jersey’s Consumer Fraud Act. His intellectual property work consists mainly of trademark, copyright infringement, and trade secret litigation in federal court.


In his 20 years of legal experience, Marc has also taken numerous appellate cases to successful conclusions. His appellate work has run the gamut from First Amendment cases involving religious liberty to issues of first impression on New Jersey’s Construction Lien Law. He has taken cases to appellate courts both when the firm represented the client below and when the case has been taken initially as an appellate matter.


Marc earned his J.D., magna cum laude, from Notre Dame Law School, where he worked as the research assistant to Professor G. Robert Blakey, the recognized drafter of the RICO statute, and served as Conflicts Editor for the Journal of Legislation.  After graduation, Marc clerked for the Honorable Harold A. Ackerman in the United States District Court for the District of New Jersey. In his previous position at a major New Jersey law firm, he chaired the firm’s Pro-Bono Committee and supervised cases involving prisoners’ rights, protection of landmark buildings, and the appropriate scheduling of marijuana in New Jersey.

Licensed for 28 years
State NJ
Status Active
Acquired 1994
Updated 03/07/2023

We have not found any instances of professional misconduct for this lawyer.

Contact Marc

Walsh Pizzi O'Reilly Falanga LLP
1037 Raymond Blvd
Suite 600
Newark, NJ, 07102


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AVVO RATING 7.2 (Very Good)

Work Experience

  • Partner
  • Walsh Pizzi O'Reilly Falanga LLP
  • 2016 - Present
  • Partner
  • Connell Foley, LLP
  • 1995 - 2016
  • Law Clerk
  • United States District Court For the District of New Jersey
  • 1994 - 1995
  • Law Clerk
  • Notre Dame Law School - Professor G. Robert Blakey
  • 1992 - 1994
View all work experience


  • Notre Dame Law School
  • JD - Juris Doctor
  • 1994
  • University of Dallas
  • BA - Bachelor of Arts
  • 1991


  • New Jersey State Bar Association
  • Member
  • N/A
  • American Bar Association
  • Member
  • N/A
  • Federal Bar Association (New Jersey chapter)
  • Member
  • N/A
  • Essex County Bar Association
  • Member
  • N/A
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  • Aspatore Book Publication
  • Common Issues in IP Law: Leading Lawyers on Resolving Disputes, Evaluating IP Claims and Achieving Successful Client Outcomes
  • 2008
  • New Jersey Law Journal
  • One Pitfall in Purchasing a Common-Law Trademark: A Look at the Continuous Use Requirement
  • 2008
  • New Jersey Law Journal
  • RICO Still an Option for Defrauded Creditors
  • 2007
  • Metropolitan Corporate Counsel
  • Offers of Judgment in Copyright Cases
  • 2004
  • Civil RICO Report
  • Did Reves Give Professionals A Safe Harbor Under RICO?
  • 1993
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Commercial real estate Attorney | Feb 08
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Newark Antitrust and trade law Lawyer Marc Denis Haefner
Marc Denis Haefner
Antitrust and trade law Attorney
Newark, NJ
Licensed for 28 years