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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
31 Client Reviews
Showing 11 - 15 of 31 reviews
Posted by Michael | January 19, 2026 | Hired Attorney
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
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...
Posted by John | January 12, 2026 | Hired Attorney
Highly professional and results-oriented
Jason was professional and extremely effective in helping me in my case involving harassment. He took the time to visit me at my home, understand my circumstances and stay on top of the case through some twists and turns. He knows the law, he knows the courts and he will work closely with you to get ...
Posted by anonymous | January 12, 2026 | Hired Attorney
successful resolution out of court through diversion program
my daughter was caught using a fake id to purchase a bottle of wine in new hampshire. we hired jason to help us resolve this matter. jason was super responsive and provided excellent service every step of the way to successfully resolve this matter out of court (through nh's diversion program). if yo...
Posted by anonymous | January 09, 2026 | Hired Attorney
People should know how well Mr Grosky works with his clients and how he was always available to answer any questions.
My family has had an excellent experience with Attorney Jason Grosky. Mr. Grosky from the initial consultation was very professional and genuinely cared. Mr. Grosky was clear and concise with all his communication throughout the entire process. His professionalism and hard work just shows how dedic...
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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