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Our firm specializes in a number of areas of law and takes pride in the dedication and commitment invested into every case. We understand that at times, our services are required during periods of extreme hardship and duress. It is our goal to provide to you, the direction and guidance you will need when you most require it.
I have been practicing law since 1996. Since then, the vast majority of my private clients have been referred to me from former clients who were happy with my representation. I take pride in my work, strive to obtain positive results for my clients, and genuinely care about everyone I represent. I regularly practice in the District Courts, Superior Courts, Appeals Court, and Supreme Judicial Court. I also practice in the Federal Court at the District and Appellate level. I represent people charged with every crime, including first-degree murder. I am also highly experienced in personal injury and family law.
I have been named one of the top 5% of criminal defense attorneys by Superlawyer Magazine for the past 6 years in a row.
3
Practice Areas
30 years
30 years
30 years
We have not found any cost information for this lawyer
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Chat withState: Massachusetts
Acquired: 1996
No misconduct found
630 Boston Road, Billerica, MA, 01821
21 Client Reviews
Showing 1 - 5 of 7 reviews | Practice Area Knowledge
Posted by anonymous | February 10, 2026 | Hired Attorney | Criminal Defense
Knowledgeable, Strategic, and Trustworthy Criminal Defense Attorney
Attorney Jennifer O’Brien is highly knowledgeable in criminal defense. This was our first time facing a legal situation, and what began as an exaggerated matter was handled with professionalism and care. She guided us through the process clearly and confidently, and her strategy and coordination with...
Posted by Tyrell | September 18, 2016 | Hired Attorney | Criminal Defense
The Best Lawyer Ever!
I hired Jennifer for a criminal case that I had. The cops pulled me over in Lowell and searched my car. I was charged with drug possession. I met with Jennifer and she read my police report. Immediately she said that this was an illegal search and that there is a good chance that we can get this case...
Posted by Jill | September 15, 2016 | Hired Attorney | Wills & Living Wills
Great lawyer, recommend to family & friends
Anytime I or someone I know needs a lawyer Jen is the first one I think of & recommend. She did a wonderful job with our wills & health proxies giving us a little piece of mind. Jen also helped a family member with a divorce. She fought for her clients best interest & made a difficult situatio...
Posted by J. Lisa | September 13, 2016 | Hired Attorney | Family
Highly Recommended!!
Attorney O'Brien is someone you would want on your side. Her years of experience reflect in her professional disposition as in my case. Attending court is never easy and can be very stressful, however Attorney O'Brien is someone who you can trust and will represent your best interests to the fullest...
Posted by D. Miller | August 31, 2016 | Hired Attorney | Appeals
Amazing Appellate Attorney
Jennifer was my appellate lawyer for a Murder 1 appeal, she did an amazing job, she was attentive, answered all & any of my questions in full detail, explained each element of my case, case errors & correspondence in full detail, she guided me through a very tough time of life to the best ability. Je...
"Attorney O’Brien is at the top of the profession! She’s an extraordinarily talented and successful attorney. Her intelligence, diligence, and tenacity make her the lawyer any client would be blessed to have in their corner. I rely on her counsel often to cooperatively defend clients who find themselves in the most challenging of circumstances. Whether the legal matter is an appeal, or a complex trial with formidable challenges -- without a doubt -- Attorney O’Brien is the lawyer I want on my side; and, clients with everything at stake would be extremely fortunate to have her on their side. She’s a no-nonsense, highly experienced, imminently experienced attorney!"
"Attorney O'Brien is a brilliant appellate advocate and trial attorney. I have worked with her on many matters and she truly is a creative, diligent and passionate attorney. I would recommend Attorney O'Brien to any attorney seeking professional guidance or creative solutions to complex legal matters."
"I endorse this lawyer. Jen is that type of lawyer who gets it! She understands the issues of divorce and all of her cases and clients. She knows what needs to be done. She is realistic about what goals are acceptable and what are not. She is up front with the client, especially those i have sent to her, they all have been very happy with the service and results she has accomplished. Jen has that way of telling you what is real and not real -- my clients need to hear this and they appreciate the advice. I have known Jen for over 15 years as a lawyer and friend, have appreciated the mutual support we have grown to expect."
"Attorney O'Brien is a rare lawyer who provides exceptional service at a reasonable rate. Her office is run with efficiency and personal care. All clients (which I have gladly referred over the past decade) have expressed joy with her service."
"I have worked with Jennifer for many years and I can say unequivocally that she is an outstanding criminal defense and appellate lawyer. She is very knowledgeable about the law, and her tremendous writing ability and keen eye for issue spotting allow her to advocate for her client's in a way that only an attorney with 20 years of experience can. I cannot recommend Jennifer highly enough; not only is she a tremendous attorney, but her thorough preparation of every case allows her clients to breathe easier knowing they are in very capable hands."
"Jennifer is an exceptionally skilled criminal defense lawyer in my opinion. I have worked with her on major felony cases, including murder appeals. Most importantly, she is down to earth, cares deeply about her clients’ cases, and fights for her clients tirelessly. I highly recommend her!"
Criminal defense lawyer
Personal injury lawyer
Criminal defense lawyer
Estate planning lawyer
Divorce and separation lawyer
Bankruptcy and debt lawyer
Appeals lawyer
Divorce and separation lawyer
Criminal defense lawyer
Criminal defense lawyer
2025
Super Lawyer, Super Lawyers Magazine
2024
Super Lawyer, Super Lawyers Magazine
2023
Voted superlawyer for criminal defense, Super Lawyers Magazine
2022
Voted Super Lawyer for criminal defense, Super Lawyer’s magazine
2021
Voted Superlawyer for Criminal Defense, SuperLawyers Magazine
2020
Voted Superlawyer for Appellate Practice, Superlawyers Magazine
2017
Favorite Billerica Attorney - 1st place, Wicked Local Magazine Reader's Choice
2017
Favorite Regional Attorney - 2nd place, Wicked Local Reader's Choice
2016
Favorite Attorney-Honorable Mention, Wicked Local Reader's Choice
1998 - Present
owner, O'Brien Law Offices
1996 - Present
Middlesex County Bar Association
1996 - Present
Greater Lowell Bar Association
Me trial awarded, and case dismissed after defendant serves 19 years.
Convictions vacated
Motion to suppress allowed and case dismissed
motion to suppress allowed - case dismissed
conviction reversed and vacated
conviction reversed and vacated
conviction reversed and vacated
conviction reversed and vacated
conviction reversed and vacated
guilty plea vacated and new trial awarded
conviction reversed and vacated
new trial motion allowed
conviction vacated and new trial awarded
new trial motion allowed
new trial motion allowed
conviction reversed and vacated
conviction reversed and vacated
conviction vacated and new trial awarded
conviction reversed and vacated
conviction vacated and new trial awarded
conviction reversed and vacated
new trial motion allowed
conviction reversed and vacated
1996
JD - Juris Doctor
1992
BA - Bachelor of Arts
2010
Appellate Advocacy
2011
2011
2010
2010
2010
2010
2010
English
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