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 16 - 20 of 177 reviews
Posted by anonymous | May 10, 2023 | Lawsuits & Disputes
Thank you Jonathan!
This might be the first review/rating I have ever left for anything, and Jonathan is well deserved for my first review. I cannot thank him enough for his support. He was so responsive and very quick to reply to all my questions. Even after we decided to not move forward with building a case he was st...
Posted by anonymous | April 28, 2023 | Hired Attorney
My Trusted Advisor
An incredible mind and top subject matter expert. A quick read and study. Focused on doing the right thing for his clients at all times, regardless of time of day. Built up trust in an instant, was my guiding light at my darkest moment and kept me grounded and focused. No question was a hard ques...
Posted by Jim | April 11, 2023 | Hired Attorney | Employment & Labor
Exceptional counsel
I have worked with Jonathan for years now after decades in the financial industry. He is by far the most skillful, confident labor contract lawyer I have found. I highly recommend him.
Posted by anonymous | March 09, 2023 | Hired Attorney | Contracts & Agreements
Results You Can Trust
Jonathan negotiated a sophisticated deal for me and he was a true professional who fought for me. I would strongly recommend him to anyone seeking an advocate who will fight for them and justice. Total pro.
Posted by anonymous | February 01, 2023 | Lawsuits & Disputes
A lawyer you can trust!
I feel blessed that was referred to Jonathan. He is not only an unbelievable lawyer, but simply just cares and is passionate about helping people. I am so glad I had Jonathan as my advocate. He knows what is right and no one knows how to handle big corporations better than him to get you what you des...
"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