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 111 reviews | Case Results
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 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 | 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 ...
Posted by anonymous | July 05, 2023 | Employment & Labor
Aggressive Workers' Rights Lawyer
Employers who break the law do anything and everything in their power to delay and avoid paying for their actions. Jonathan keenly understands what it takes to bring a hostile defendant to the table to bring recompense for aggrieved employees.
"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