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A career prosecutor now fighting for you.
Representing clients before courts in Massachusetts and New Hampshire.
Jason B. Grosky, Esq. spent almost two decades as a courtroom prosecutor both in Massachusetts and New Hampshire. Each day, he's worked alongside police officers, assisting them on their cases, helping direct their investigations. He understands how a case is built from day one, the work of a detective, how officers think, their methods. He’s argued thousands of cases in front of judges and juries and earned a reputation as a hard-charging courtroom litigator. He's a fighter.
Now, he wants to fight for you.
If you’ve had an interaction with law enforcement and need legal counsel, give Attorney Grosky a call. The Grosky Law Firm focuses on criminal defense, impaired driving (DUI/OUI/DWI), motor vehicle infractions and administrative hearings, personal injury, juvenile law, divorce, family law and domestic relations including restraining orders stalking orders of protection and New Hampshire municipal law.
Proven experience.
Proven results.
Now on your side.
Fighting for you.
Free Consultation
$0 first 30 minutes
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Chat withState: New Hampshire
Acquired: 2009
No misconduct found
State: Massachusetts
Acquired: 2006
No misconduct found
105 Kenoza Ave, Haverhill, MA, 01830
30 Client Reviews
Showing 1 - 5 of 10 reviews | Advocacy
Posted by anonymous | March 25, 2026 | Hired Attorney | Criminal Defense
Exceptional - Highly Recommend
He is truly the best of the best! He responded quickly, was incredibly knowledgeable, and didn’t hesitate to take immediate action when my hearing was expedited and we had only two days to prepare. He put my mind at ease while guiding me through one of the most stressful and frightening experiences o...
Posted by RD | March 20, 2026 | Hired Attorney | Criminal Defense
Best in the business
If you need a defense attorney, call Jason Grosky! He went above and beyond and facilitated everything for me. He knows the process and the system and is on your side from day one. I was more than happy with the outcome and I would call him again if need be.
Posted by Alfred | December 29, 2025 | Hired Attorney | Criminal Defense
Very committed and skilled attorney
Mr.Grosky represented me in a case in which I was looking at significant time. He did this pro bono. He was extremely professional in every way. When we first met to go over the case he was very thorough in collecting all my info. He did not rush at all and gave me the definite sense that he really c...
Posted by anonymous | October 20, 2025 | Hired Attorney | Criminal Defense
Exceptional Attorney
Jason Grosky is an exceptionally experienced, dedicated, and driven attorney. I came to Jason on a recommendation from a coworker who spoke just as highly of him as I now do. My case involved a driving incident with a Class A Misdemeanor charge, carrying the possibility of a large fine, potential ...
Posted by Austin | August 26, 2025 | Hired Attorney | Lawsuits & Disputes
Great guy, Great attorney!
Before meeting Jason Grosky I was an anxious mess. I got myself in a mess that I had no idea what to do. After just one consultation with Jason not only was my anxiety gone but I had a good idea of what was going to happen with my case. He explained everything to me in an easy manner and did not c...
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2025 - Present
Principal, Grosky Law Firm
2009 - 2025
Prosecuting Attorney, Salem (NH) Police Department
2007 - 2009
Assistant District Attorney, Essex County District Attorneys Office
2006
JD - Juris Doctorate