We are unwavering criminal defense attorneys, representing clients in Essex, Middlesex, Norfolk, Plymouth, Suffolk, and Worcester County, Massachusetts. When the stakes are highest, we provide bold, calculated legal protection. No tricks—just powerful defense and meaningful results.




The Law Office of Matthew W. Peterson grew from one attorney’s commitment to providing meaningful legal representation into a trusted resource for individuals facing serious legal challenges. With more than 25 years of experience practicing law, the firm has focused not only on sound legal advocacy, but also on providing steady guidance during difficult and uncertain times.
Each case is approached with care and seriousness, recognizing that the outcome can have lasting consequences for a client’s future. Guided by professional responsibility, courtroom experience, and respect for the legal system, the firm continues its work advocating for fair treatment and due process for every client it represents.
Boston Office
Salem Office
With experience, fidelity, and a focus on results, we give criminal defense that prioritizes your rights, so you feel supported and confident every step of the way.
Our criminal defense firm combines quality representation with straightforward pricing, so you can get expert legal help without the heavy cost.
Every case is deeply personal to us. We advocate with the urgency and commitment your situation deserves—because for many, the outcome truly matters.
We give clear, straightforward criminal defense guidance so you can confidently navigate your legal situation and understand each step along the way.

Mariah Selby
Paralegal

Franchette Rodqiguez
Case Manager

Adrian Jake
Intake Specialist

Elijah Judson
Legal Assistant

Mariah Selby
Paralegal Expert

Franchette Rodriguez
Case Manager

Adrian Jake
Intake Specialist

Elijah Judson
Legal Assistant
Posted on P VTrustindex verifies that the original source of the review is Google. Incredible team! Commend them on their professionalism, deep knowledge & experience, kindness, responsiveness, efficiency and overall concern for their clients. Highly recommend Attorney O’Brien and his stellar team. They deserve 5/5 stars and more.Posted on Nicole RamirezTrustindex verifies that the original source of the review is Google. The Law Office of Matthew W Petterson was very helpful and made my divorce experience seamless.Posted on Ricardo SilvaTrustindex verifies that the original source of the review is Google. They helped me with my Marriage based green card process. Everything was simple and every time I had any questions or concerns, I could quickly schedule a call with Mr. Peterson! Thank you for your help and I totally recommend it. We had to submit the paperwork 3 times, but upon final submission, it took 4 months to get my case approved!Posted on Tyler HunterTrustindex verifies that the original source of the review is Google. Amazing experience having the law office of Matthew W Peterson take my case. Chris did such an outstanding job, with such professionalism I can’t thank him enough! And the entire staff made everything such a breeze to work with them. Especially for someone out of state!Posted on Douglas ATrustindex verifies that the original source of the review is Google. Im so thankful with attorney Matthew Peterson I Was going through problems that could’ve got me jail time but thanks to his Intelligence and strategics he got my case dismissed. I would 100% recommend him if you ever need an attorney to represent in court and help you with criminal chargesPosted on Alisha UnderwoodTrustindex verifies that the original source of the review is Google. If you find yourself needing legal help in the Boston area, give this firm & Attorney Manchinton a call. The entire firm was very supportive and responsive throughout my entire case. I could tell Attorney Manchinton genuinely cared and felt a sense of indignation about what I was going through. We were able to get the best possible outcome - a dismissal at the clerk magistrate level which was such a relief. Don’t hesitate, don’t call someone else, hire the Law Office of Matthew W. Peterson.Posted on MikeTrustindex verifies that the original source of the review is Google. Matt and team were very professional and helped me understand everything. Highly recommend!Posted on Michele “Michelec”Trustindex verifies that the original source of the review is Google. Amazing lawyer!!! Prepared, available, and effectiveVerified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more