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William J. Sipser

Wrongful termination Attorney at New York, NY

4.5   8 reviews

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About William

Learn William’s areas of practice.

As one of the founding partners of Tuckner, Sipser, Weinstock & Sipser, LLP, Mr. William Sipser has been a leading practitioner in the area of Labor Law and Employment Law Discrimination for almost thirty years. His practice includes extensive litigation experience in state and federal courts, and before several governmental agencies involving representation of individuals and labor unions. Mr. Sipser has prosecuted significant cases, including appeals before the Appellate Division of the State of New York as well as the federal Court of Appeals for the Second Circuit. He argued a critical employment discrimination issue before the New York State Court of Appeals, New York’s highest court, in September 2004. Mr. Sipser has briefed, argued and won important cases before the New York State Appellate Division, First Department, in Manhattan. Mr. Sipser has also tried hundreds of administrative cases and arbitrations concerning employment issues, including grievances and discharge cases.


Recognized for his success in participating in employment discrimination alternative dispute resolution, Mr. Sipser was one of the featured speakers and participants in a forum on mediation of employment disputes in a continuing legal education seminar held at Benjamin N. Cardozo School of Law.


Mr. Sipser served as an Assistant Commissioner for Labor Relations in the New York City Department of Correction, where he was responsible for ensuring stable labor relations in this major city agency, with its approximately 13,000 uniformed and civilian employees. He also served as an Associate in the law firm of Sipser, Weinstock, Harper & Dorn, LLP, and worked extensively and closely with his late father, I. Philip Sipser, who was one of the foremost labor attorneys in the country.


Mr. Sipser graduated from Benjamin N. Cardozo School of Law where he was an Associate Editor of the Association of Student International Law Societies’ International Law Journal.


Mr. Sipser is admitted to the New York State Bar, the Washington D.C. Bar, the New Jersey State Bar, the United States District Courts in the Southern and Eastern Districts of New York as well as the District of New Jersey and the Second Circuit United States Court of Appeals.

Licensed for 36 years
State DC
Status Good Standing
Acquired 1988
Updated 06/08/2022
State NJ
Status Active
Acquired 1986
Updated 11/08/2022
State NY
Status Due to Register within 30 Days of Birthday
Acquired 1986
Updated 11/17/2022

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

Contact William

Tuckner, Sipser, Weinstock & Sipser, LLP
120 Broadway
Floor 18
New York, NY, 10271
Tuckner, Sipser, Weinstock & Sipser, LLP
42 Catherine Street
Poughkeepsie, NY, 12601
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4.5 / 5.0
  8 customer reviews
5 Star
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1 Star
Posted by Louise | March 21, 2020
This review is from a person who hired this attorney.
| Hired Attorney
A++ Rating from a legal insider.
I've spent many years surrounded by lawyers, as that was my career for close to 10 years. So when I needed an attorney myself, when my rights were violated - i wanted the best representation and I got it. Attorney Sipser is one of the most brilliant, dedicated, hard working, detail oriented and passionate advocates I have ever known. I mean that with all sincerity and credibility. I am very hard on lawyers, I expect the best. Hiring Attorney Sipser, I got the absolute best. I am beyond grateful for his diligent representation, and the wonderful way he and his staff handled a very emotional situation with caring patience kindness and understanding. He has dedicated his life to fighting for the rights of Women, and he successfully does. From a knowledgable Staff who know you and your case personally (this is so rare!) , to his personal attention, to the superior quality of legal research and writing, to his passionate advocacy and personal interest in every case.... Attorney Sipser is one of the greatest Attorneys I have ever known, or hired. I have read many briefs in my life, and the level of research and legal advocacy in my case pleadings was the best of the best. The amount of time and detail and research was incredible. He’s simply brilliant. Beyond all this -- he CARES. He cares DEEPLY, and that is what makes all the difference when hiring an attorney. It did for me. I am so grateful for his passionate advocacy in my case. If you need an attorney, please do not hesitate for a second, if you hire Attorney Sipser you are in the absolute BEST hands.
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Posted by Marion | April 29, 2019
This review is from a person who hired this attorney.
| Hired Attorney
The most Pleasant and professional law firm that I ever had the pleasure of dealing with thank you very muc
Posted by Gladys | January 31, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Mr. Bill...The One and Only
William Sipser helped me resolve a case that I had contacted him about and executed it with compassion and empathy. He was efficient and effective and I am satisfied with the results
Posted by Tracy | January 22, 2019
This review is from a person who hired this attorney.
| Hired Attorney
A lawyer who cares
Bill took on my case and never gave up no matter the hurdles my old job threw at us. He made me feel important, returned calls and emails quickly. He always went through everything slow and gave me time to ask questions. I felt that someone was on my side fighting for and with me.
Posted by Monica | December 31, 2018
This review is from a person who hired this attorney.
| Hired Attorney
Wonderful experience
Mr. Sipser and his team were fantastic. They were with me every step of the way and always made me feel comfortable. Dealing with a lawsuit can be a daunting task, and if you don’t have the right lawyer, you have nothing. I always felt comfortable asking for help or suggestions and following his advice. I honestly sing his praises to anyone who will listen!
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Posted by Laura | December 20, 2018
This review is from a person who hired this attorney.
| Hired Attorney
The Best Choice
I had absolutely no idea what I was doing or if I was even right. I was extremely lucky that I found Bill and Deborah at the get go. From my initial call and very careful kind questioning to help me figure out if there was a case, all the way through to receiving my settlement they were there every step of the way. I was always well prepped as to expectations and very well educated about my options. I could not have asked for a better experience.
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Posted by Carl | December 4, 2018
This review is from a person who hired this attorney.
| Hired Attorney
Tuckner& Sipser
The firm was diligent in reaching a speedy resolution to my litigation. I always got my questions answered when I called the firm. I would highly recommend them to my friends.
Posted by anonymous | November 12, 2017
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Not knowledgeable, Not Engaged, Can’t Be Bothered
I contacted this law firm because they are supposedly all about protecting woman’s rights in the employment arena. The woman who does intake is great so I expected better for my consultation. When the time came, Mr. Sipser had not even bothered to go over the info given at intake. He knew nothing about my situation and was impossible to have a conversation with. He said he’d get back to me but never did. Not the kind of lawyer any woman would want at such a difficult time.
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  • Free Consultation 30 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 8.4 (Excellent)

Work Experience

  • Partner
  • Tuckner, Sipser, Weinstock & Sipser, LLP
  • 1992 - Present
  • Assistant Commissioner for Labor Relations
  • New York City Department of Correction
  • 2015 - 2015
  • Associate
  • Sipser, Weinstock, Harper & Dorn, LLP
  • 2015 - 2015


  • University of Wisconsin
  • BA
  • 1981
  • Yeshiva University, Benjamin N. Cardozo School of Law
  • JD - Juris Doctor
  • N/A

Legal Cases

  • Defeated motion to dismiss
  • Jay Mitchell Bauman, M.D., Appellant-Respondent, v The Mount Sinai Hospital et al., Respondents-Appellants.
  • Dismissal of case reversed
  • Lee Saunders et al., Respondents-Appellants, v. New York City Health and Hospitals Corporation, Appellant-Respondent.
  • Court upheld case asserting illegal use of temporary employees


  • New York City Department of Correction
  • Assistant Commissioner
  • N/A
  • New York State Bar Association
  • Admitted
  • N/A

Languages Spoken

  • English

Honors and Awards

  • Super Lawyer
  • Super Lawyers
  • 2018
  • Super Lawyer
  • Super Lawyers
  • 2017
  • Super Lawyer
  • Super Lawyers
  • 2016
  • Super Lawyer
  • Super Lawyers
  • 2015
  • Super Lawyer
  • Super Lawyers
  • 2014
  • Super Lawyer
  • Super Lawyers
  • 2013
  • Super Lawyer
  • Super Lawyers
  • 2012
View all awards


  • International Law Journal
  • Associate Editor for Association of Student International Law Societies' International Law Journal
  • N/A

Speaking Engagements

  • Forum on Mediation of Employment Disputes, CLE
  • Mediation of Employment Disputes
  • N/A

Attorney endorsements

Received (0)
Given (0)
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New York Wrongful termination Lawyer William J. Sipser
William J. Sipser
Wrongful termination Attorney
New York, NY
Licensed for 36 years
Free Consultation