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Karen Piso Nadeau

Car accident Attorney at Cambridge, MA

5.0   16 reviews
  • Licensed for 30 years
    State MA
    Acquired 1992
    Active No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Karen

Learn Karen’s areas of practice.

Practice areas
  1. Car accident

  2. Personal injury
    Representing plaintiffs in personal injury cases for over 25 years including car accidents, motorcycle and truck accidents, pedestrian and bicycle accidents, slip and falls, dog bite and construction site accidents.

    31 years

  3. Slip and fall accident

  4. Animal and dog bites

  5. Brain injury

  6. Motorcycle accident

  7. Wrongful death

After 27 years of impressive verdicts and settlements, Attorney Karen Piso Nadeau has built a reputation as an unrelenting champion for the rights of injured people all across Massachusetts. She concentrates her practice at Nadeau Harkavy LLC in the area of serious personal injury. Attorney Nadeau has enjoyed great success winning cases in a wide range of personal injury matters, from car accidents and pedestrian injuries to multi-million dollar catastrophic injuries involving negligent individuals and some of the region's largest corporate entities. Karen has also enjoys considerable success representing victims of slip and fall accidents as well as dog bites and attacks, which often require a keen understanding of the case, skillful coordination of experts, and aggressive representation of the client. She is a zealous advocate for her clients and uses her legal acumen, skill, and experience to obtain the best possible results, either through artful settlement negotiation or meticulously prepared and delivered litigation.

Karen is particularly adept in the nuances of negotiations with insurers, medical providers, corporations, and other attorneys. She has worked closely with area insurance companies and is exceptionally well-versed in their policies, common arguments, and burdens of proof. As Nadeau Harkavy LLC's owner and seasoned personal injury attorney, she has personally negotiated multi-million-dollar settlements for clients who suffered injuries at the hands of others, including negligent individuals and companies of all sizes. Often, these cases do not initially appear to have the value they ultimately reach in the eyes of insurers. Many are reluctant to offer full value in the hopes that those aggrieved by loss will accept a modest settlement offer, far below fair value. Karen, with her years of experience, knows that her negotiation strategies ensure the best result possible under the circumstances. She will not stop unless and until she is certain she has done everything she can for a client.

In short, Karen is revered and respected by her clients, colleagues, judges, and opposing counsel as one of the most talented, dedicated, and passionate personal injury attorneys in the state. She gives her full time and attention to each case, with a plethora of experts and resources at her disposal to present the best case possible. She is not afraid to go toe-to-toe with the area's most powerful individuals and corporations to get what her clients rightfully deserve.

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Nadeau Harkavy LLC
1 Mifflin Place, Suite 400
Cambridge, MA, 02138


5.0 / 5.0
  16 customer reviews
5 Star
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Posted by Karen | August 9, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Attorney Karen Nadeau- A rare diamond in the legal world
I can't say enough about Nadeau Harkavy, LLC. My experience was with attorney Karen Nadeau, who was wonderful from the moment I met her until my case was settled. Her ability to listen and empathize with my situation was comforting during a stressful time. I was not her only client, but she made me feel as though I was. It is rare to have an attorney make themselves available to their clients on the level that attorney Nadeau did. There was never a time I didn't know exactly where my case stood and what the next steps were going to be. Attorney Nadeau went above and beyond for me, for which I am thankful. I can say wholeheartedly, that if you find yourself in need of a personal injury attorney, you would be in the best and most capable hands with Nadeau Harkavy, LLC.
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Posted by Franca | July 3, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Excellent! Extremely Greatful :)
Karen and her team were able to help me to understand what to expect and how to obtain a fair outcome. She has the experience that one needs in these type of situations of personal injury. I am amazed at how good she truly is! I recommend her highly to anyone who has any type of injury.
Posted by Connie | September 21, 2019
This review is from a person who hired this attorney.
| Hired Attorney
More money than I imagined!
I was severely injured while participating in an exercise class. The insurance company wanted to blame me but Karen Piso Nadeau knew better. She advocated for me and supported me throughout this difficult process. When the insurance company made a small offer, she went back again and again until they came up with an award I deserved. I can't state strongly enough how grateful I am and how wonderful it was to work with her. Tough, knowledgeable and compassionate.
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Posted by Janelle | September 13, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Absolutely Amazing!!
Karen was amazing! She supported and guided me throughout the entire process! I could not have asked for better! She went above and beyond in every aspect!
Posted by Kristy | July 17, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Very satisfied client
Karen is the best. I highly recommend her. She fought so hard for my case and never gave up. She ended up getting me more of a settlement than i was expecting or thought possible. She is a fighter and a go getter. You definitely want her on your side. I recommend her to everyone I meet.
Posted by MAURA | May 22, 2019
This review is from a person who hired this attorney.
| Hired Attorney
Extremely Grateful
Karen Nadeau was the first attorney who did not turn down my case simply because it would be difficult to win and likely would not garner a high settlement. She was not phased! She took my case and treated it as though it was just as important as a high profile case. She communicated with me at every stage of the process, and she was patient and respectful in every correspondence. Her persistence and attention to detail led to winning an excellent settlement. I am extremely grateful for Karen Nadeau's service, and I thank her here by highly recommending her for any personal injury legal needs.
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Posted by Lynne | April 5, 2019
This review is from a person who hired this attorney.
| Hired Attorney
From the moment I connected by phone I knew this was the lawyer for me! Without any stress she guided me easily thru the process! I was in a horrible car accident and suffered bad injuries...a good friend recommended Karen because she had been in the same predicament and made out extremely well in her settlement!! I am so happy today because I got a great result also thanks to Karen’s hard work!!! Because of Attorney Karen Nadeau I could concentrate on my recovery and not even think about my case while Karen did all necessary work on my case for me w amazing results! She was ALWAYS available when I needed her! I HIGHLY recommend her!! Thank you Attorney Karen Nadeau!!
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Posted by Christina | May 23, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Fabulous Results!
Putting trust in someone when a loved one is lying in hospital bed seriously injured was nerve racking for me. I called Bellotti Law the morning after my boyfriend got hit by a SUV cycling because I knew there were some serious injuries. They had someone there by the afternoon to document everything. Karen was the first person I worked with. She explained things very thoroughly as to how to get the best outcome and I made sure my boyfriend followed her advice to the letter. That advice made such an impact on the case in the long run. The hardest part was dealing with the frustration with the other guys insurance. The best way I can describe our attorney is a very smart pit bull. After 18 months we really didn't want to go to court unless absolutely necessary. She listened to all of our thoughts and concerns and got everything we asked for and more! When my boyfriend called to tell me the good news, I was standing in Costco and started crying. I'm genuinely grateful. I do know how money hungry lawyers are made out to be, but I respect the amount of quality work that the whole firm does to get results. Everyone there, from the moment you walk in to the moment things are concluded, is classy, professional, and efficient. I hope I never need another personal injury attorney again, but if I do you will certainly be my first call. Christina C.
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Posted by Jenny Louise | December 1, 2016
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Excellent attorney, and go-to person
I have known Karen for more than sixteen years, and regard her both as a colleague, and an impressive go-to person from early in my career. She is an exceptional personal injury attorney. I admire her energy, grace under pressure and creativity. Early in my professional life, I often sought her guidance and counsel in identifying and formulating legal issues in multi-faceted litigation, and welcomed her criticisms when drafting legal arguments. She frequently offered a unique perspective on difficult cases, which ultimately led to success and excellent results for clients.
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Posted by Josephine M. | September 30, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Helped when I was down
In my previous job, I met numerous attorneys and had the pleasure to work with several over the years. None of them had expertise in car accident cases. I didn't know Karen before my accident, but she was recommended by a lawyer whose opinion I trust. I asked for a couple of names but he said there is only one name, Karen Nadeau, that he needed to give me. He spoke very highly of her and urged me to call her. When I found out that attorney Nadeau represents people with really serious injuries I first thought my case might be too small for her. When I told Karen my concern she gave me a warm smile and politely dismissed it. She reassured me that my case was important to her and that I would quickly learn that the entire office values its clients.
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Posted by Jessica, Boston RN | September 5, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Amazing Attorney
I could not thank Karen and her law firm enough for the representation she provided me during such a difficult time. She was incredibly responsive and tenacious battling the insurance company's attorney. I will be forever greatful for her.
Posted by Michael | July 4, 2016
This review is from a person who hired this attorney.
| Hired Attorney
* The Best *
I was attacked by a family members' dog. My physical injuries were thankfully not severe, but I did experience some unfortunate PTSD-like symptoms for some time afterward. Atty. Nadeau made me feel at ease right away with her compassionate and understanding, down to earth manner. I also felt very encouraged by her positivity, experience and professionalism. The case took some time; I began to occasionally have some doubt about it's outcome, but they were cast aside as soon as I was able to speak with her on the phone and receive an update. My case was not a high dollar one, but I feel like she gave it the same amount of care and attention to detail as she would have if it were. In the end she fought to get me the biggest settlement possible, as was successful in doing so. I was thoroughly impressed with both her and with the entire experience of working with her firm. I would recommend her to anyone, and believe that there is no case she could not handle successfully and with ease
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Posted by Danny | January 11, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Great to Work with!
Karen is one of the best personal injury attorneys in Boston. It was great to have her on my side. Karen kept me informed throughout my case, explaining every part thoroughly and answering any questions I had pertaining to. I could not have been happier with the outcome, which was exactly what I was promised. I would strongly recommend her to anyone who has been in an accident.
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Posted by Dr. Jones | December 29, 2015
This review is from a person who hired this attorney.
| Hired Attorney
Excellent, tireless and dedicated litigation attorney
I am a client who needed legal help in a complicated litigation matter. I hired Karen after a recommendation from a colleague. Karen won my case, she is an excellent personal injury attorney, very smart, relentless and a joy to work with!
Posted by Mary | December 22, 2014
Excellent lawyer and law firm - highly recommend
Following a serious accident on a ride at an out-of-state amusement park, I was overwhelmed with medical bills, missed time from work and limited ability to handle the daily routines for my three young children. Growing up in Quincy, my family and Peter's knew each other. I went to him for advice and was quickly assured that he and his firm could help me through this. Karen was my primary attorney. She was fabulous in so many ways... confident, experienced, efficient, sympathetic and committed to getting me the best settlement as quickly as possible. She and paralegal Marijane handled the tons of information needs from the hospital, doctors, amusement park and insurance companies. Karen kept me informed about each step of the process, what my options were, how other similar cases were resolved, and advised me how to proceed. She also promised to not settle for less than what she believed I was entitled. In the end, the final settlement was much larger than I anticipated. The peace of mind and thorough understanding of the process and options that Karen provided meant a lot to me. I highly recommend her for her proven experience and success on behalf of clients. Such a high level of skill and personal attention is hard to find, but Karen and her colleagues possess and practice both -- you can be confident that the Bellotti Law Group will do all that they can for you.
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Posted by Jerome | August 20, 2014
excellent service
I received top-notch representation from Attorney Karen Nadeau and Bellotti Law Group and couldn't be happier with the results. Attorney Nadeau and the firm were recommended to me as being fantastic and able to put me at ease following my injury. Attorney Nadeau exceeded my expectations in every way-- she was very responsive and effective in all aspects of the case. Even the staff at Bellotti Law Group was great-- Marijane, Karen's paralegal, was always exceptionally nice to speak with and kept me updated as to my case.
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  • Free Consultation 30 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 9.9 (Superb)

Work Experience

  • Owner and Personal Injury Attorney
  • Nadeau Harkavy LLC
  • 2019 - Present
  • Manager and Senior Attorney of Personal Injury Department
  • Bellotti Law Group, P.C.
  • 2009 - 2019
  • Attorney for injured victims
  • Bellotti and Barretto, P.C.
  • 2001 - 2009


  • Suffolk University Law School
  • JD - Juris Doctor
  • 1992
  • Boston College
  • BA - Bachelor of Arts
  • 1989

Legal Cases

  • Personal Injury-Construction Site & Pedestrian
  • Settlement for $1,000,000.00 policy limits
  • Personal Injury- Dramshop and Over Serving of Alcohol
  • $2,200,000.00
  • Personal Injury- Dog Bite & Dog Attack
  • Settled for $300,000.00 policy limits


  • Massachusetts Bar Association
  • Member
  • N/A
  • U.S. District Court District of Massachusetts
  • Member
  • N/A
  • U.S. Court of Appeals, First Circuit
  • Member
  • N/A
  • Women's Bar Association
  • Member
  • N/A
View all associations

Languages Spoken

  • English

Honors and Awards

  • 2019 Top 100 Civil Plaintiff Trial Lawyers
  • The National Trial Lawyers
  • 2019
  • 2019 10 Best Attorney Client Satisfaction
  • American Institute of Personal Injury Attorneys
  • 2019
  • 2016 Top 10 Personal Injury Attorneys in Massachusetts
  • American Institute of Personal Injury Attorneys
  • 2016
  • 2015 Top 10 Personal Injury Attorneys in Massachusetts
  • American Institute of Personal Injury Attorneys
  • 2015
View all awards


  • Boston Injury Attorneys Blog
  • Selected Topics, Massachusetts Personal Injury
  • 2013
  • Boston Injury Attorneys Blog
  • Selected Topics, Massachusetts Personal Injury
  • 2012
  • Boston Injury Attorneys Blog
  • Selected Topics, Massachusetts Personal Injury
  • 2011
  • Boston Injury Attorneys Blog
  • Selected Topics, Massachusetts Personal Injury
  • 2010
View all publications

Speaking Engagements

  • Stewards Safety Meeting, New England Carpenters Local 26
  • What If You Are in A Serious Accident
  • 2014
  • Serious Personal Injuries
  • 2013

Attorney endorsements

Received (6)
Given (5)
Endorse Karen
Personal injury Attorney | Aug 26
Relationship: Co-worker
"Karen is one of the most hard working, professional and ethical lawyers I know. She is tenacious and aggressive when needed and a fierce advocate. If I needed a referral to a personal injury attorney, I would not hesitate to refer to Karen."
Personal injury Attorney | Aug 16
Relationship: Supervised lawyer
"I endorse this lawyer. I have known and worked with Attorney Nadeau for many years. She previously worked for me at my former firm and she thereafter further honed her advocacy skills practicing law for many years and most recently starting her own firm with Attorney Harkavy. I have witnessed and can attest that Attorney Nadeau is a tenacious and tireless worker who is adept at handling a vast array of personal injury matters for Plaintiffs and defendants alike. She has extensive litigation experience with cases small and large, is excellent interacting with clients and keeping them informed on the progress of their cases. Attorney Nadeau has a long track record of successful results for her clients and I have no doubt that this same pattern will continue in her new role. I highly recommend Attorney Nadeau."
Personal injury Attorney | Aug 06
Relationship: Opposing Counsel on matter
"I highly recommend Attorney Karen Piso Nadeau. I got to know Karen when she was opposing counsel on a serious personal injury case in which I was involved. She represented her clients with diligence, zeal, and thoroughness. She was always well-prepared for depositions and court appearances and conducted herself with integrity, candor, and tact. I found that she was extremely knowledgeable about the law and strategy of handling personal injury cases and had an impressive record of successes representing injured clients. I believe that any client would be fortunate to have Karen on their side."
Personal injury Attorney | May 11
Relationship: Co-worker
"I endorse this lawyer. She is responsible for numerous high monetary awards for her clients who suffered injuries from car accidents, slip and fall, brain injuries, wrongful death, dog bites and other personal injury cases. No attorney works harder than Karen to represent her clients and obtain the best possible outcomes. She is extremely knowledgeable about personal injury law, having worked for both sides - plaintiff and defendant. She easily applies the law to the specific facts of her client's case to enable insurance companies to justify her excellent results. She has top notch communication skills and puts clients at ease throughout an otherwise stressful legal process."
Personal injury Attorney | Aug 23
Relationship: Other
"Karen is a fabulous attorney and a consummate professional and, in my opinion, one of the top personal injury lawyers in Boston. When I was searching for a top accident attorney in Massachusetts, Attorney Nadeau’s name came up repeatedly. When I first spoke with her it was clear she was very knowledgeable about bicycle accidents, motorcycle, truck, and auto accidents because of her knowledge of the law and her trial skills. She is one of those lawyers who says what she'll do and does what she says. I really appreciate her thoughtfulness, creativity and quite simply her legal IQ. I unequivocally recommend Attorney Karen Nadeau."
Unknown Attorney | Apr 23
Relationship: Co-worker
"I first met Attorney Karen Nadeau as an intern while I was in law school. From day one, I admired her dedication to clients, attention to detail, and seasoned skill—in and out of the courtroom. Quite simply, she possesses all the attributes of an outstanding lawyer and is one that I model my own career after. I now interact with many attorneys in my daily practice, but very few practice with the same zeal, commitment, and high aptitude that Attorney Nadeau consistently employs. Case in point, when my girlfriend was seriously injured in an accident last year, there was no hesitation with who I advised her to call. Given Karen’s lengthy resume of success, my expectations were high regarding her handling of the matter, but she has still managed to exceed them. Attorney Nadeau has rightly earned her reputation as one of the most polished trial lawyers in Massachusetts. She is extremely well regarded by her peers, judges, and most importantly, her clients, to whom she is a true asset"
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