Sean Mack, The Stein Public Interest Center Photo

Sean Mack

Co-Chair, Cannabis & Hemp Law and Co-Chair, Litigation


Sean Mack is the co-chair of the Cannabis and Hemp practice and co-chair of the firm’s Litigation practice. Clients turn to Sean for his steadfast guidance, sincere interest in the success of their businesses, and extensive knowledge of New Jersey’s regulations and case law in the cannabis and hemp industries, for both adult-use recreational marijuana and medical marijuana.


With significant experience counseling business owners in complex disputes, Sean brings a unique set of skills to businesses interested in cannabis and hemp. Sean advises Hemp-CBD companies on state and federal laws affecting their advertising and businesses. He also works in tandem with Pashman Stein’s attorneys to offer clients counsel in the interplay between cannabis/hemp laws and corporate, employment, intellectual property, health care and real estate laws.

Recognized on the InsiderNJ “Insider 100: Cannabis Power List” in 2022, 2021, and 2019 as an influential voice in the cannabis debate, Sean has been active in cannabis reform since 2015, when he led a team of the firm’s attorneys to analyze existing cannabis laws and regulations to prepare proposed legislation for New Jersey United for Marijuana Reform (NJUMR). NJUMR then presented the firm’s proposal to a state senator for incorporation into an early draft of the bill to legalize adult use marijuana in New Jersey.

Sean advises businesses interested in applying for cannabis or hemp licenses in New Jersey, which is a highly competitive and nuanced process, and he has represented clients in appeals of the 2018 and 2019 rounds of medical marijuana license applications. 

He also advises companies and individuals on the specific protections afforded to medical marijuana patients under the Jake Honig Act in employment, the receipt of medical services, and real estate.  

Business Litigation

Sean’s business litigation practice focuses on complex disputes involving unfair business competition. He regularly represents businesses, business owners and senior executives in lawsuits involving theft of corporate opportunities, theft of trade secrets, breaches of non-competition agreements, breaches of confidentiality and non-disclosure agreements, and other unfair business practices. Clients often retain Sean when a joint business venture has gone awry or when they believe it is time to divorce their business partners. Many of his cases arise from complicated contractual and licensing disputes. He also has represented clients in trademark and trade dress infringement cases and in counterfeiting cases. With his strong business acumen, he is often brought in to advise firm clients on bankruptcy and insolvency-related issues, and has represented creditors and debtors in bankruptcy proceedings. He also has represented several firm clients in contested probate proceedings.

Appellate Advocacy

Sean is an experienced appellate advocate, having presented appeals in many federal and state courts. Sean often leads teams of Pashman Stein attorneys to prosecute appeals of complex matters that were lost at the trial level by other law firms. 

Sean began his legal career with Debevoise & Plimpton LLP, where he practiced commercial litigation for many years before joining Pashman Stein in 2005.

In Sean's Words:

"As co-chair of the firm’s Cannabis and Hemp practice, I have a rare opportunity to assist entrepreneurs and business owners as they form and operate new ventures in New Jersey’s quickly growing recreational adult-use industry. The laws and regulations are evolving and are often in conflict at the state and federal level, presenting challenges to an already competitive landscape. The protections afforded to medical marijuana patients under New Jersey law, in employment, medical services and real estate, also present significant business issues for clients and considerable review in our courts. On behalf of our clients in the cannabis and hemp industries, I collaborate with my Pashman Stein colleagues to provide a full spectrum of cannabis-related legal and business counsel." 


Reported Decisions

  • National Lighting Company, Inc. v. Bridge Metal Industries, LLC, 601 F.Supp.2d 556 (S.D.N.Y. 2009)
  • Strahan v. Strahan, 402 N.J.Super. 298 (App. Div. 2008)
  • Arnold v. Arnold, 2007 WL 1146627 (N.J. App. Div. 2007)
  • In re XO COMMUNICATIONS, INC., 323 B.R. 330 (Bankr. S.D.N.Y. 2005)
  • Hawa Abdi Jama v. Esmor, 343 F.Supp.2d 338 (D.N.J. 2004) and 334 F. Supp 2d 662 (D.N.J. 2004)
  • Burns v. Anderson, 123 Fed.Appx. 543 (4th Cir. 2004)
  • In re RSL Primecall, Inc., 2003 WL 22989669 (Bankr. S.D.N.Y. 2003)


Honors & Recognitions

Selected for inclusion in the list of:

  • InsiderNJ, “Insider 100: Cannabis Power List,” 2022, 2021 & 2019
  • Best Lawyers, Commercial Litigation, 2013-2023
  • New Jersey Super Lawyers, 2016-2022
  • New Jersey Super Lawyers, Rising Star, 2010-2013

The Super Lawyers list is issued by Thomson Reuters. A description of the selection methodology can be found at

The Rising Stars list is issued by Thomson Reuters. A description of the selection methodology can be found at

The Best Lawyers list is issued by Woodward/White, Inc. A description of the selection methodology can be found at

The Insider 100: Cannabis Power List is issued by Insider NJ. A description of the selection methodology can be found at

No aspect of this advertisement has been approved by the Supreme Court of New Jersey.

News & Insights

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Community & Professional

  • Member, New Jersey Bar Association
  • Member, Bergen County Bar Association
  • Former Member, District II-B Ethics Committee

Bar Admissions

  • New Jersey
  • New York

Court Admissions

  • U.S. District Court, District of New Jersey
  • U.S. District Court, Southern District of New York
  • U.S. District Court, Eastern District of New York
  • U.S. District Court, Northern District of New York
  • U.S. Court of Appeals, Second Circuit
  • U.S. Court of Appeals, Fourth Circuit
  • U.S. Court of Appeals, Sixth Circuit


B.A., College of the Holy Cross, 1995, cum laude

J.D., Rutgers University School of Law, 1999, with highest honors, Order of the Coif

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