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 109 reviews | Employment & Labor
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 Jonathan | March 18, 2025 | Employment & Labor
Excellent experience!
Jonathan recently helped me through an employment contract matter. This was a first time experience for me, and he was extremely friendly, knowledgeable, and provided excellent consultation in an understandable way. The matter was resolved in a timely manner with a very positive outcome, and I woul...
Posted by anonymous | December 11, 2024 | Employment & Labor
Best in class
Jonathan was great - he helped answer all of my questions about my severance package and offer letter from another firm. He was very responsive and gave me lots of time and attention. I highly recommend him to anyone.
Posted by anonymous | June 19, 2024 | Employment & Labor
Insightful Advice, and Very Prompt
I asked Jonathan to review my employment agreement. I sent it to him on a Sunday, and he gave an answer in 30 minutes. In our follow up discussion at 9 PM (!) two days later, Jonathan was very thorough. He pointed out a number of flaws in the agreement. Ultimately, he put my mind at ease on the matte...
Posted by anonymous | February 25, 2024 | Hired Attorney | Employment & Labor
Trusted Advisor
I was referred to Jonathan by a former colleague who also negotiated a settlement with my employer. From the minute that I reached out to his office Jonathan was responsive, helpful and sympathetic. I was initially taken aback by Jonathan's aggressive style but as we worked together we developed a ...
"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."
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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