Free Consultation
$0 first 30 minutes
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
Quickly connect with top attorneys through our legal directory to get help with your legal issue.
Chat with a live agent who can match you with the right attorney for your legal needs.
Chat withState: New Hampshire
Acquired: 2009
No misconduct found
State: Massachusetts
Acquired: 2006
No misconduct found
105 Kenoza Ave, Haverhill, MA, 01830
27 Client Reviews
Showing 1 - 5 of 12 reviews | Criminal Defense
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 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...
Posted by John | January 12, 2026 | Hired Attorney | Criminal Defense
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 | Criminal Defense
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...
No Endorsement Data Available Yet
This attorney hasn't received any attorney endorsements recently on Avvo.
No Endorsement Data Available Yet
This attorney hasn't created any attorney endorsements recently on Avvo.
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