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 106 - 110 of 111 reviews | Case Results
Posted by jean | October 03, 2017 | Hired Attorney | Lawsuits & Disputes
A true professional and a fighter
I have been Jon's client for 4 years on couple high stake cases. He truly delivers big. He is a hard worker and has been always available rain or shine. His partners Eric Stern and Michael Mui are on top of their game and have a true insight on how the case is going and how to push it to a win. ...
Posted by anonymous | October 02, 2017 | Hired Attorney | Employment & Labor
best of breed -- poised to be your advocate
I interviewed 9 attorneys before hiring Jonathan. I chose him because I wanted an advocate, a champion and someone who had my back. When working in a hostile environment where 'employment' means uncivil and zero-sum treatment, you want a coach to direct you through, give you a game plan and assure...
Posted by anonymous | April 11, 2024 | Hired Attorney | Lawsuits & Disputes
One of the WORST in the business
The other one star reviews are 100% accurate. He is a vile human being and is fake nice at first only to turn on you once he thinks your case isn’t worth millions. He pawns you off on junior staffers who are just as incompetent. He expects clients to write their own complaints! I’m not a lawyer! Mess...
Posted by anonymous | December 02, 2022 | Hired Attorney | Wrongful Termination
Didn't handle case properly
Didn't handle case properly. He totally misjudged the situation, which resulted in very poor compensation from an employment termination case.
Some clients have an unrealistic sense of what their case is worth. With a contingency fee arrangement, our interests are aligned with the client's interests. We always try to zealously represent a client to maximize the outcome and achieve the client's goals.
Posted by anonymous | December 12, 2017 | Hired Attorney | Lawsuits & Disputes
AVOID!!!!!! TOTAL HACK!
I wish that I could give him ZERO stars. All bark and no bite. Total unprofessional, would cancel appointments while I was on the subway on my way to his office. He pawns you off on junior lawyers in the office as he's too busy vacationing around the world. Does not stick to deadlines and makes y...
"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