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 26 - 30 of 67 reviews | Practice Area Knowledge
Posted by anonymous | January 21, 2021 | Hired Attorney | Employment & Labor
Managing Director
Having worked with several top rated employment attorneys over the years in various capacities, I can attest Jonathan was outstanding. He not only has a deep knowledge and command of employment law, but he is thoughtful, patient and persistent. He guided me through a complex situation that played out...
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 Rose | November 26, 2020 | Hired Attorney | Employment & Labor
Excellent legal talent
Mr. Sack worked with me in gaining a completely satisfying result from my employer. But he did not stop there- on a regular basis Jonathan keeps me appraised of further options I can take, should I want. He does not waste time or provide misleading information. I have consulted and even retained othe...
Posted by Christopher | November 16, 2020 | Employment & Labor
Non Compete Assistance
Jon was excellent at helping me interpret and deal with a non compete issue. His knowledge of these issues is unparalleled compared attorneys with whom I have dealt on similar matters. He also helped me negotiate a new employment agreement in detail. I recommend him highly.
Posted by Lindsay | August 24, 2020 | Contracts & Agreements
Director
I’m grateful for Jonathan’s expertise as he helped me negotiate a contract with my employer. Jonathan was straightforward, thoughtful and bullish about getting me what I deserved. I would highly recommend Jonathan and will seek his counsel again.
"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