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 71 - 75 of 177 reviews
Posted by anonymous | January 21, 2021 | Employment & Labor
Consultation - Great Experience
I outlined my situation and he provided great advice on how I should handle exiting my work situation with favorable terms that I thought were fair.
Posted by anonymous | January 21, 2021 | Employment & Labor
Strategic and Aggressive
I consulted with Jonathan as I needed help extricating myself from my previous employer. He was extremely responsive, gave actionable recommendations, and was strategic on how the negotiations would play out with and without litigation. While I did not pursue a lawsuit route, he prepared me for th...
Posted by anonymous | December 15, 2020 | Hired Attorney | Business
President
Jonathan has been a tremendous help in navigating the legalities of my startup business. His no nonsense approach was instrumental in achieving the necessary contractual framework for my business. Jonathan is extremely efficient and helped achieve these goals while keeping billable hours to a minim...
Posted by anonymous | December 15, 2020 | Hired Attorney | Wrongful Termination
The Best in the Business
After being wrongfully terminated from my employer I interviewed five counselors to represent me. I am very fortunate to have chosen Jonathan. Jonathan was a zealous advocate for my cause and produced impressive results in an efficient manner. The personal touch and care for my situation was unexp...
Posted by Jean | December 11, 2020 | Hired Attorney | Employment & Labor
Employment and labor, Arbitration, Litigation Attorney
Mr. Sack was at all times forthright, direct and concerned about my case. I was laid off due to Covid 19 and Mr. Sack negotiated with the Human Resources Department at my institution for a greater severance. While this was ultimately unsuccessful I have the utmost faith in Mr. Sack for his knowledgea...
"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