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 51 - 55 of 111 reviews | Case Results
Posted by Lindsay | August 24, 2020
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.
Posted by Bonnie | August 11, 2020 | Hired Attorney
Severance Agreement
This is the second time in my career in which Johnathan has navigated me through challenging situations. The first time was untangling me from a non-compete agreement to accept a new role. Most recently, Jonathan guided me through achieving a mutually agreeable separation from an extremely difficult...
Posted by anonymous | August 07, 2020
Consulted with Twice
I have consulted with Jon twice about 2 different employment situations. His advice was invaluable and helped me through a difficult negotiation both times. He detailed all of my options and possible outcomes and gave advice that was clearly in my best interests. Both times, the outcome was better th...
Posted by anonymous | June 08, 2020 | Hired Attorney
Tough as nails
Jonathan is a no nonsense, aggressive attorney. He will tell it to you straight even if it’s not what you want to hear but it’s the reality and he knows from years of experience. Jonathan’s tone can be abrupt and to the point, there is no mincing words with him, but you can rest assured, it’s this sa...
Posted by anonymous | June 03, 2020
Account Manager
I consulted Jonathan Sack about a severance letter I received from my employer, which recently reduced staff. I did not know IF I had a case to negotiate more severance benefits but Jonathan guided me to ask the right questions. Turns out I did not have a case other good performance reviews, which ...
"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