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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.
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$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
24 Client Reviews
Showing 1 - 5 of 24 reviews
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 anonymous | March 10, 2026 | Hired Attorney
Highly Recommend Jason Grosky
I had the pleasure of working with Jason Grosky during a particularly challenging time, and I cannot speak highly enough of his counsel. Though my case never proceeded to trial, Jason's guidance throughout the process was invaluable. He was knowledgeable, responsive, and consistently demonstrated a c...
Posted by Michael | January 19, 2026 | Hired Attorney | Family
Extremely professional
I cannot recommend this defense attorney highly enough. From the very beginning, Attorney Grosky handled an extremely sensitive case that involved family with professionalism, compassion, and discretion. Communication was outstanding — every step of the process was clearly explained, questions were a...
Posted by Mitchell | January 13, 2026 | Hired Attorney | Criminal Defense
Best lawyer ever.
Honestly, He's like having your best friend in a court room. He's a great guy, very knowledgeable, and gives you a strong since of security. I highly recommend when in need, because there's no one else you'll want by your side if you find yourself on the wrong side of the law. 10 out of 10 would hire...
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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