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 151 - 155 of 177 reviews
Posted by anonymous | November 13, 2017 | Hired Attorney | Employment & Labor
Anonymous
Jonathan was direct and thorough during the whole process of filing and arbitration. He was available to discuss concerns and issues whenever I needed him. He put my mind at ease and explained clearly what would be happening. Jonathan and Michael Mui did an excellent job in representing me and making...
Posted by anonymous | November 02, 2017 | Hired Attorney | Employment & Labor
Smart, to the point, gets it done.
Jonathan was able to cut through a nuanced employment dispute to quickly get to the essence. He was aggressive, yet fair-minded, reasonable, and restrained when leading the negotiation. Before choosing Sack & Sack, I interviewed a number of high-profile attorneys and heard out their proposed stra...
Posted by Perrin | October 26, 2017 | Hired Attorney | Lawsuits & Disputes
Great advice
I know that Jon and his team were working for me and with me. We spent almost 3 years and eventually settled. I always felt that Jon and Michael Mui had my best interests at heart and I was very satisfied with their performance.
Posted by Liz | October 19, 2017 | Hired Attorney | Discrimination
Amazing Advocate to have on your side
Jonathan is extremely knowledgeable, fierce, straight forward, and compassionate. He is definitely the advocate you need when you are being discriminated by your employer. Jonathan made sure the timing was right before pulling the trigger on my case. He made sure I was emotionally and financially ...
Posted by anonymous | October 11, 2017 | Hired Attorney | Contracts & Agreements
Confidence boost
Jonathan advised me through the negotiation of a structurally complicated situation. Gave valuable advice on negotiating, which in the end came to a resolution for which he did not need to get involved directly and for which he only charged a small fee to review the agreements. Yes, he can be very to...
"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