I am a results-oriented, energetic advocate for my clients. I am passionate about representing my clients. As most cases come from word-of-mouth referrals, I am proud of my reputation built one client at a time. Most clients are faced with a difficult challenge in a critical part of their lives: their jobs and careers. I am competitive and look forward to taking the fight to the employer to redress unfair and illegal actions. I align our firm's fee arrangement with the client's desired outcome so that there is an identity of interest in the result sought. My success is defined by each client obtaining the desired outcome as a consequence of my effective counsel. Most of all, I love what I do, and that is helping people and seeking fair results for clients who deserve better treatment from their employers.
5
Practice Areas
37 years | 5,000 cases
37 years | 200 cases
37 years | 400 cases
37 years | 500 cases
33%-40%
State: New Jersey
Acquired: 1989
No misconduct found
State: New York
Acquired: 1989
No misconduct found
State: District of Columbia
Acquired: 1991
No misconduct found
177 Client Reviews
Showing 1 - 5 of 10 reviews | Staff & Support
Posted by anonymous | March 22, 2026 | Hired Attorney | Employment & Labor
Highly recommend: Effective and Highly Efficient
My lawyer was effective and highly efficient throughout the process. One of my biggest fears was having to regularly see the abuser and even a more hostile environment while the case was handled. Prior to Mr Sack’s involvement, individual regularly aggressively screamed at me and intimidated me (6’...
Posted by Andrew | October 30, 2025 | Hired Attorney
We needed help fast and Jonathan got it done.
Jonathan's experience is apparent. He cuts through the noise. He is very well connected. His whole team is engaged. And he gets results.
Posted by anonymous | February 02, 2022 | Hired Attorney | Arbitration
Someone who truly puts his client first
I reached out to Jonathan to help me arbitrate a case against my former employer. From day one Jonathan explained the process and steps involved. I was always consulted and my opinion was taken into account. He diligently prepared the case and fought it. His team was outstanding, taking down a powerf...
Posted by Jeff | December 14, 2021 | Hired Attorney | Employment & Labor
Couldn't have asked for better counsel . . .
There is no one who I would want more in my corner than Jonathan Sack. He was always there for me (especially during some very trying times) and was an incredible voice of reason in helping me successfully bring to closure an unfortunate dispute with my former employer and investment firm. His tea...
Posted by anonymous | May 14, 2021 | Hired Attorney
Best there is
Jonathan really listened to me from Day 1; and he and his team provided amazing guidance throughout my entire process. He was always available, no question of mine was too small, and he gave me so much hope during a very difficult time. His entire team is fantastic and made sure that I was comfortab...
"Jonathan is one of the most professional, effective, and direct attorneys I have ever met. His knowledge of labor and employment law is vast and very respected. You can't go wrong having him on your team."
No Endorsement Data Available Yet
This attorney hasn't created any attorney endorsements recently on Avvo.
2025
Super Lawyer, Super Lawyers
2024
Super Lawyer, Super Lawyers
2024
Client's Choice, Avvo
2023
Super Lawyer, Super Lawyers
2017
Super Lawyer, Super Lawyers
1986
Dewey Scholarship, Dewey Scholarship
1989 - Present
Partner, Sack & Sack, LLP
1989 - Present
New York State Bar Association
1989
JD - Juris Doctor
1986
BA - Bachelor of Arts
English