John is a member of the Professional Liability Department where he focuses his practice on employment law including counseling employers in preventing and defending against whistleblower claims, wrongful termination, sexual harassment, discrimination, and retaliation claims, as well as advising employers on individual and group termination decisions, leaves of absence, accommodating disabilities, workplace privacy, and employment agreements. Additionally, John provides guidance to employers regarding trade secret and restrictive covenant issues and litigates related claims in Federal and State courts.
John most recently was a name partner in a regional law firm focused on employment and commercial litigation matters. Since 2004, John has represented and advised corporations as outside counsel at the nation's top law firms and served as General Counsel at a mid-sized manufacturing company based in Southern New Jersey. As a litigator, he has tried more than ten cases to verdict over his career.
John brings a deep understanding and sensitivity to the daily challenges and cost considerations companies face. Accordingly, in his role as advisor and advocate, he functions as a virtual extension of clients’ in-house legal and human resources teams, working in integrated partnership with them to protect the company's best interests and bottom line.
John is a proud graduate of Milton Hershey School (MHS), a private philanthropic boarding school in Hershey, Pennsylvania, established in 1909 for financially impoverished children. After eight years at MHS, he attended the University of Pennsylvania on a Navy ROTC scholarship and walked-on the NCAA Division I Crew Team, making the Varsity boat. After graduation, John served as an Infantry Officer in the United States Marine Corps and was honorably discharged at the rank of Captain after five years of service, including deployments to Japan and the Middle East.
Year joined
2024
Pro Bono
Civil Pro Bono Panel for the District of New Jersey
Community Service
Program Director, Cherry Hill Girls Travel Basketball League (2017-present)
Soccer Coach, Cherry Hill Travel Soccer Club (2015-2024)
Results
Obtained a “No Cause” Verdict in an Employment Case in New Jersey
Employment Law
September 20, 2024
We recently obtained a “no cause” verdict in an employment case in the Superior Court of New Jersey. The plaintiff, an employee of a New Jersey State entity, asserted violations of the Contentious Employee Protection Act (CEPA). According to the plaintiff, after reporting purported deficiencies with an environmental permit, he was subject to a retaliatory and hostile work environment.
Summary Judgment Obtained in Breach of Contract Case
Commercial Litigation
May 3, 2024
We secured summary judgment on behalf of a custom-home builder in a breach of contract case. The plaintiffs contracted with our client to build their dream home, but, due to the plaintiffs’ change of scope and the increase of costs and services, an attempt was made to modify the parties’ contract. The plaintiff objected and submitted the dispute to the parties’ chosen arbitrator for a binding decision. The arbitrator fully sided with the builder; however, the plaintiffs moved before the Superior Court of New Jersey to have the arbitration award vacated.
Thought Leadership
Employment Law Attorney John P. Mueller Joins Marshall Dennehey as a Shareholder in Mount Laurel
Employment Law
April 24, 2024
Employment law attorney John P. Mueller has joined Marshall Dennehey’s Mount Laurel office as a Shareholder in the firm’s Employment Law Practice Group.
Classes/Seminars Taught
“What Employers Need to Know About the Legalization of Recreational Cannabis,” Hunterdon County Chamber of Commerce, April 2021
