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John has owned and operated the Firm since forming it in 2009. He concentrates his practice in all aspects of employment law litigation with a focus on sexual harassment, sex assault, sex trafficking, whistleblower retaliation, Qui Tam litigation, pregnancy and disability discrimination, and all other areas of employment law and civil rights violations. John has experience in all phases of complex civil litigation, both state and federal, and has successfully tried numerous cases to a conclusion from both a plaintiff and defendant’s perspective.
From an employment defense standpoint, the Firm’s clients range from a host of different industries and businesses in New York and New Jersey. These include several New York City upscale hotels, restaurants, and nightclubs, as well New York and New Jersey based law firms, engineering firms, environmental contractors, apparel manufacturers, and non-profit organizations. In over 17 years of representing the City of Newark handling a significantly large level of employment cases that go to trial every year, John has not lost a single trial or appeal for the City.
Our Firm continues to be trusted to defend some of the most prominent leaders and professionals in the country. We have represented U.S. Senators, sitting judges, mayors of major cities, as well as CEOs, venture capital executives, and law firm partners from some of the largest and most prestigious law firms in the world. Drawing on 20 years of employment defense work, we bring a proven ability to navigate high-stakes employment litigation with discretion, an aggressive strategy, and a diligent focus on protecting our clients’ reputations and interests.
From a Plaintiff’s perspective, John continues to be one of the go-to lawyers for clients who are C-Suite executives and key employees in the financial, legal, real estate, and health care industries involving complaints of discrimination and retaliation in Manhattan and New Jersey. In that regard, John has successfully tried dozens of cases to verdict, and succeeded in numerous arbitrations and obtained high value settlements for his individual clients.
During law school, John was a Member of the Moot Court Honor Society and represented Seton Hall Law in a national constitutional law tournament in Madison, Wisconsin, finishing as a quarterfinalist. John was also an intern with the Hudson County Prosecutor's Office for two years in their homicide division, and a paralegal with Cadwalader, Wickersham & Taft in New York City in their Securitization division.
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Practice Areas
7 years
7 years
7 years
7 years
We have not found any cost information for this lawyer
State: New York
Acquired: 2017
No misconduct found
State: New Jersey
Acquired: 2005
No misconduct found
State: District of Columbia
Acquired: 2017
No misconduct found
Mobile
225 Broadway, Suite 3800, New York, NY, 10007
employmentdiscrimination.com/Mobile
354 Eisenhower Parkway, Suite 1250, Livingston, NJ, 07039
employmentdiscrimination.com/Other places you can find John online.
18 Client Reviews
Showing 1 - 5 of 18 reviews
Posted by KM | March 17, 2026 | Hired Attorney | Employment & Labor
Highly Skilled and Reliable Unemployment Attorney
I’m so grateful I found John J. Zidziunas. Dealing with unemployment issues can be overwhelming, but John made the entire process clear and manageable. He was incredibly knowledgeable, patient, and always quick to respond whenever I had questions. You can tell he truly cares about his clients and ...
Posted by anonymous | February 25, 2026 | Hired Attorney | Sexual Harassment
5/5
John and his team represented me in a very serious snd very traumatic sexual harassment case. John was available day and night to answer my questions and I felt extremely informed and protected at all times. They did an outstanding job and I could not be more pleased with the results.
Posted by LS | January 31, 2026 | Hired Attorney | Lawsuits & Disputes
Employee Discrimination Case NYC
John is a high‑energy, analytical lawyer who knows his field extremely well. Quick to act, readily available, and reassuring in how he explained each step throughout the process. In a case involving a large financial institution, John handled everything with the highest level of professionalism an...
Posted by anonymous | November 14, 2024 | Hired Attorney | Employment & Labor
Dedication and Fierce
John and his team were an unstoppable force representing me during a super difficult and delicate situation. John and his team practically made themselves available 24/7 which is rare in today’s world. Highly recommend his law firm to anyone dealing with employment issues.
Posted by Daniel M | October 02, 2024 | Hired Attorney | Discrimination
Pregnancy Discrimination case... HUGE win for my wife and family
Im writing this on behalf of my wife who hired John to represent her for a pregnacy discrimination case against one of the biggest banks in the US. After contacting several lawyers when we found out about my wife being laid off 5 days before our baby due date, we were worried that we would not find s...
"John was an incredibly worthy adversary in a matter that was vigorously litigated. He handled his client's interests with zeal and adeptness. He always put his client's interest above his own. I give John my highest endorsement of a colleague and adversary of impeccable character and trustworthiness."
"John was a gentleman and a professional in the matter that I handled with him. I wish I could say that for all my adversaries. I endorse this lawyer's work."
"Mr. Zidziunaas and I initially started working together in May of 2009, since that time I have found him to be a responsible and diligent attorney."
Employment and labor lawyer
Employment and labor lawyer
Commercial real estate lawyer
2005
National Quarterfinalist-Constitutional Law, Moot Court Honor Society
2009 - Present
Owner, John J. Zidziunas & Associates
2005 - 2006
Judicial Law Clerk, Honorable Barbara A. Curran, S.J.C.
2013 - Present
NELAMember
Member
Member
Member
2005
JD - Juris Doctor
2000
BA - Bachelor of Arts
N/A
English
Spanish