



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 15 years of combined 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.

Margaret Petersen
Attorney

Mariah Selby
Paralegal

Franchette Rodriquez
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 Noah LynchTrustindex verifies that the original source of the review is Google. I cannot say enough good things about Attorney Matthew Peterson. I’ve had the privilege of working with him over the past 13 months, and throughout that entire time he has been nothing short of exceptional. Matthew is extremely knowledgeable, thorough, and strategic, but what truly sets him apart is how invested he is in his clients. He took the time to fully understand my situation, explained every step of the process clearly, and always made sure I felt informed and prepared. Even during stressful or uncertain moments, he remained calm, responsive, and professional, which gave me a great deal of confidence. His communication was outstanding — prompt, honest, and straightforward — and he never made me feel rushed or dismissed. It was clear from day one that he genuinely cares about achieving the best possible outcome for his clients, not just closing a case. If you are looking for an attorney who is sharp, dedicated, and truly has your best interests at heart, I highly recommend Attorney Matthew Peterson. Working with him over the past year plus has made a difficult process far more manageable, and I’m extremely grateful for his guidance and support.Posted on Jason Hinton IITrustindex verifies that the original source of the review is Google. Mr.Peterson and his entire staff were incredibly helpful, with best intentions always in mind I got caught in an unfortunate situation while bringing my LEGAL firearm in my home state (Florida) to Massachusetts, and got the book thrown at me for possession related charges. Originally I was facing 4 felonies and 3 misdemeanors from the situation After some time Mr.peterson got the DA’s office to drop 2/4 felonies and reduce 1 felony to a misdemeanor before we even got to the pre-trial negotiations So I was then facing 1 felony, and 3 misdemeanors, after some more time he got the DA to accept a plea for me to get 1 year of probation and the final felony thrown out. So all and all 4/4 felonies got dropped and I got a CWOF so once I complete my year of probation I will have nothing on my record at all. Side note, Mr. Peterson and his team are still actively working to get my $1,500 hand gun returned to me (the police have had it since the night they took it) If you do find yourself in a bad situation, I couldn’t recommend attorney Peterson, and his team enough, I know I’ve said it a lot to you personally Mr Peterson but genuinely from the bottom of my heart I greatly appreciate the time and effort you and your entire team put into my case, and I hope that eventually Massachusetts will choose to be pro 2A so law abiding citizens like myself don’t get caught in unfortunate interstate gun situations.Posted on Miles KleinTrustindex verifies that the original source of the review is Google. I had the privilege of working with Attorney Chris O’Brien. The process was highly collaborative, and I was kept informed every step of the way. He was effective in court, even when dealing with a disagreeable judge. I am 100% satisfied with both the process and the outcome.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 chargesVerified by TrustindexTrustindex verified badge is the Universal Symbol of Trust. 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