Fighting For Boston Families For More Than A Decade

Personal Injury 2022
Better Business Bureau Accreditation
Massachusetts Academy of Trial Attorneys
Medical Malpractice 2022
Massachusetts Bar Association
Best Lawyers
American Association for Justice
The National Trial Lawyers Top 40 Under 40

About Sweeney Merrigan Law

After suffering an injury in an accident, you need a lawyer you can trust. The experienced attorneys at Sweeney Merrigan Personal Injury Lawyers are dedicated to making our community safer and holding negligent parties accountable for the harm they have caused. 

Our Mission

Our mission is to create a safer community by holding responsible parties accountable and building trust through transparent communication and unwavering support for our clients. We provide first-class legal representation, ensuring our clients’ rights are protected and their voices heard.

At Sweeney Merrigan Personal Injury Lawyers, we are committed to fighting for justice and fair compensation for our clients in Boston and across Massachusetts.

Commitment to Justice

Our commitment to achieving justice on your behalf is at the forefront of everything we do. Our practice is built on a foundation of experience, empathy, and the tireless pursuit of fair compensation for those affected by negligence in Massachusetts. We recognize that every accident is unique and take a client-centric approach to every case.

Why Choose Our Personal Injury Law Firm?

At Sweeney Merrigan Personal Injury Lawyers, we are dedicated to helping our clients recover the compensation they need after being injured by someone else’s negligence.

We understand how critical it is to choose the right attorney and want you to have full confidence in your decision to trust us with your case. A couple of factors that set us apart include the following:

Decades of Combined Experience

Our firm was founded in 2010 and continues to provide unmatched legal representation to our clients. 

Our attorneys have over a century of combined experience achieving favorable outcomes for our clients in Boston and across Massachusetts. We deeply understand the intricacies of Massachusetts personal injury law and are ready to leverage our experience and skills to fight for you. 

Proven Track Record

We have an established history of securing hundreds of millions of dollars in compensation for our clients. Our attorneys are consistently recognized for their excellence by outlets like Forbes, Best Lawyers, Super Lawyers, and National Trial Lawyers.

We have achieved notable victories and settlements across our wide range of practice areas.


Recovered for more than 100 cities and towns in an opioid manufacturer settlement.


Achieved in a medical malpractice case involving Steven-Johnson Syndrome.


Secured in a motor vehicle accident case. This settlement was reported to be the largest single-plaintiff settlement in 2022 by Massachusetts Lawyers Weekly.


Recovered in the largest sexual assault verdict in Massachusetts history.

We are consistently successful in achieving favorable outcomes for our clients and stand ready to help you recover the compensation you deserve for your physical, emotional, and financial losses. 

The goal at Sweeney Merrigan Law is to represent people who have suffered needless and preventable injuries. To help them recover, achieve closure, and to do everything we can to make sure what caused their injury, their harm, doesn't happen again.

Our Team of Legal Experts

Our exceptional team is at the heart of our success. From our experienced attorneys to our compassionate support staff, everyone on our team will ensure you are supported throughout the legal process. 

Picture of J. Tucker Merrigan, Managing Partner

J. Tucker Merrigan, Managing Partner

Attorney Merrigan co-founded Sweeney Merrigan Personal Injury Lawyers with his brother in 2010. He has recovered millions in compensation for his clients and has won awards from Best Lawyers and Super Lawyers for his consistent success. ​

Picture of Peter M. Merrigan, Managing Partner

Peter M. Merrigan, Managing Partner

Co-founder of Sweeney Merrigan Personal Injury Lawyers, Attorney Merrigan is dedicated to providing first-class legal services. He devotes 100% of his practice to litigation and was recently named a Forbes Best Truck Accident Lawyer in 2024.

Picture of Thomas T. Merrigan, Partner

Thomas T. Merrigan, Partner

Judge Merrigan has been practicing law for 48 years with 12 years of experience as a retired First Justice and Associate Justice in the Orange District Court and Appellate District Court.

Picture of Matthieu J. Parenteau, Partner

Matthieu J. Parenteau, Partner

Attorney Parentau has recovered millions of dollars in damages for his clients. He has recently been named as a Forbes Best Car Accident Lawyer in Boston, Massachusetts in 2024. 

Experienced Personal Injury Attorneys

At Sweeney Merrigan Personal Injury Lawyers, we only employ top-notch attorneys with a deep commitment to their clients’ needs. Learn more about our experienced attorneys below.

Ryan Hawkins, Senior Trial Attorney

Ryan M. Hawkins, Senior Trial Attorney

Attorney Hawkins served as a former district attorney where he tried more than 30 cases before a jury. He focuses his practice on catastrophic injuries, motor vehicle accidents, construction accidents, and premises liability. 

Erin E McHugh

Erin McHugh, Trial Attorney

Attorney McHugh has recovered millions of dollars in compensation for her clients and was named as one of National Trial Lawyers Top 40 under 40 in 2024. 

Dylan Hixson, Boston personal injury attorney

Dylan T. Hixon, Trial Attorney

Attorney Hixon focuses his practice on catastrophic injuries, motor vehicle accidents, and construction accidents as was named as one of National Trial Lawyers Top 40 under 40 in 2024. 

Kyle Camilleri, Boston personal injury lawyer

Kyle A. Camilleri, Trial Attorney

Attorney Camilleri is an experienced trial attorney who focuses his practice on motor vehicle accidents, premise liability, medical malpractice, and premises liability. He is a member of National Trial Lawyers Top 100.

Maggie K. O’Donnell, personal injury trial attorney in Boston

Maggie K. O’Donnell, Trial Attorney

Attorney O’Donnell is focused on helping her clients recover compensation for motor vehicle accidents, premises liability, and dog bites. She was named in National Trial Lawyers Top 40 Under 40 in 2024.

Our attorneys bring a wealth of experience and diverse skills to the table as they fight aggressively for their clients’ rights and interests. 

Dedicated Support Staff

Our firm is dedicated to ensuring you have a positive experience at every stage of the legal process. We employ first-class, paralegals and support staff to offer comprehensive legal services that meet your unique needs.

Our staff includes the following dedicated team members:

At Sweeney Merrigan Personal Injury Lawyers, every member of our team is committed to ensuring your unique needs are heard and addressed as we fight for you. 

Ready to Discuss Your Personal Injury Case?
Every case at Sweeney Merrigan Law is tailored to the client’s specific needs. We blend aggressive legal tactics with compassionate client support, focusing on your story and your loss. Learn how we stand by our clients every step of the way.

Our Practice Areas

Our attorneys understand the ins and outs of Massachusetts personal injury law and are ready to apply our wealth of knowledge and skills to your unique case. From medical malpractice to motor vehicle accidents, we are proud to provide our clients with best-in-class representation. 

Comprehensive Legal Services

While we focus on a wide range of personal injury accidents, our primary practice areas include the following:

This is not an exhaustive list, and there are many more types of accidents our attorneys handle. When you choose our firm, we will review every detail of your case and advise you on the best path forward.

Community Involvement

Sweeney Merrigan Personal Injury Lawyers is deeply committed to enhancing the safety and well-being of the Boston community.

Peter and Tucker Merrigan donating $15,000 to Wounded Warriors

Our firm proudly collaborates with several charitable organizations, including:

Through these partnerships, we aim to effect positive change and support vital community services in Boston and the neighboring areas.

Working With Sweeney Merrigan Law

  • What makes Sweeney Merrigan Law different from other Boston personal injury law firms?

    At Sweeney Merrigan Law, we make the case about the client. Every case is different, and so is every client. While one client might desire a quick out-of-court settlement, another might want his or her story to be told in court. It is our job to give the client options so that he or she can make an informed decision about how they want their case to proceed.

    At Sweeney Merrigan Law, lawyers work for the clients, not the other way around. We are successful because we build trust with our clients through honest communication. That means we need to talk not only about the strengths of a case but also the weaknesses. We form a partnership with our clients at the very first meeting, and we build on it all the way through the conclusion of the case.

  • How does Sweeney Merrigan Law approach personal injury cases in Boston?

    At Sweeney Merrigan Law, we have a rule that defendants cannot settle or resolve a case until they know who our client is or was. What that means is that we cannot zealously advocate for our clients until we know them and who they are. Then, the defendant must acknowledge what happened, take responsibility for what happened, and then make it right.  

  • How does Sweeney Merrigan Law structure its fees for personal injury cases?

    Because we work on contingency fees, we are only paid if we are successful. This arrangement means that our interests are aligned with our clients in that we want to efficiently achieve a maximum recovery. While we are only paid if we are successful, the decision to settle a case or take a case to trial is a decision that is only made by the client.

    However, before a client makes the decision, it is our job to achieve the maximum possible settlement offer and advise the client of the benefits and risks associated with either path.

  • Are there any upfront costs I need to pay when hiring Sweeney Merrigan Law for my personal injury case?

    Part of the contingency fee agreement means that there are no upfront costs paid by the client. If there are necessary expenses that must be paid to represent the client, those costs are advanced by Sweeney Merrigan Law.

    Some examples of these costs are filing fees, medical record costs, expert costs, and investigators costs. If the case is successful, the Sweeney Merrigan Law is reimbursed from the settlement for case expenses.

    However, in the event the case is unsuccessful (for any reason), the client is not required to pay the firm back. Sweeney Merrigan Law is always willing to spend money to build a client’s case but is also very judicious about not spending any money unnecessarily.

    At the time of settlement, clients will receive a full accounting so they can understand, if they accept a settlement, exactly how much money they will put into their pocket.

  • What kind of results has Sweeney Merrigan Law achieved?

    Sweeney Merrigan Law has achieved record-setting results for their clients, including:

    - The largest single event settlement in 2023 of $17M.

    - The largest medical malpractice settlement ever in New Hampshire of $20M.

    - The largest jury verdict in the history of Franklin County, Massachusetts of $10M which is also the largest sexual assault verdict in the history of Massachusetts.

    We represent clients who have cases both large and small and provide the full force of our firm to maximize our results.

  • What is the typical timeline for a personal injury case handled by Sweeney Merrigan Law?

    The timeline for a typical personal injury case varies from one case to another. Some factors that can shorten or lengthen will be based on whether liability is disputed, the significance of the injuries or harm, whether a client needs time to recover before resolution, and whether litigation will be required.

    Some cases can resolve in as little as six months, while others could go on for a number of years. However, in many cases, the client’s wants can influence the attorneys’ strategy in managing the timeline for the case.

    In all cases, Sweeney Merrigan Law is committed to maximizing the recovery as efficiently as possible.


At Sweeney Merrigan Personal Injury Lawyers, our approach is spearheaded by Managing Partners J. Tucker Merrigan and Peter M. Merrigan, whose leadership has propelled us to the forefront of leading personal injury firms in Boston.

We’re committed to providing each client with personalized, effective legal representation, ensuring that your voice is heard and your rights are protected. Our team is here to guide you through every stage of the legal process, making it as seamless as possible.

Schedule your free consultation today by calling (617) 391-9001 or by filling out our contact form.

Client Reviews

#1 Client Reviews

Sweeney Merrigan Personal Injury Lawyers derives its name from the large Irish-American family heritage of Attorney Peter M. Merrigan and Attorney J. Tucker Merrigan. Brothers and successful attorneys, Peter and Tucker, have teamed up to earn a strong reputation for providing personal attention to each and every client, while consistently obtaining exceptional results. Sweeney Merrigan Law takes pride in advocating and working on behalf of clients throughout all of Massachusetts.

Why Choose Us?

#2 Why Choose Us?

We want you to be confident that Sweeney Merrigan Personal Injury Lawyers is the best team for you and your case and there isn’t a better testament to the service we provide than the recommendations made by our satisfied former clients. We have recovered hundreds of millions of dollars in compensation for our clients and are ready to help you fight for a favorable outcome for your case.

Attorney Reviews

#3 Attorney Reviews

The word trust has almost become cliché when talking about hiring someone to perform a professional service. However, at Sweeney Merrigan Law, we take pride in bringing real meaning to the word trust. To us, real trust is about the strong relationships we develop with those who we represent. It is through these relationships that we ensure our clients are informed about all phases of the legal process. We understand that not every client will fully understand the legal implications of each part of a case. It is our job to keep each client informed throughout the process and provide the decision-making support they require, when they need it.