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About me

After 20 years of impressive verdicts and settlements, senior trial 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 Bellotti Law Group in the area of serious personal injury and wrongful death, particularly those cases involving children. Attorney Nadeau has enjoyed great success winning cases in a wide arrange 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 enjoyed considerable success working in the complex areas of medical malpractice, lead poisoning, and dog-bite litigation, which 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 Bellotti Law Group's senior 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, co-workers, 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.


Languages spoken: Spanish, English

Practice areas


  1. Car Accident: 35%
    24 years
  2. Wrongful Death: 20%
    24 years
  3. Motorcycle Accident: 20%
    24 years
  4. Personal Injury: 15%
  5. Medical Malpractice: 10%
    24 years

Attorney endorsements

2 total 

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  • Doug Allen Bernacchi

    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.


    Doug Bernacchi Bankruptcy and debt Attorney
    Relationship: Other

  • No photo

    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


    Alexander Asermely Litigation Attorney
    Relationship: Co-worker

Contact info

Bellotti Law Group, P.C.

25 Thorndike Street.
Cambridge, MA, 02141

Bellotti Law Group, P.C.

The Schrafft Center, Suite 128
529 Main Street.
Boston, MA, 02129-1125

Bellotti Law Group, P.C.

1250 Hancock Street
Quincy, MA, 02169



We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Work experience
TitleCompany nameDuration
Chairperson, Personal Injury DepartmentBellotti Law Group, P.C.2009 - Present
Senior Case EvaluatorBellotti and Barretto, P.C.2005 - 2009
Association namePosition nameDuration
Massachusetts Bar AssociationMemberN/A
U.S. District Court District of MassachusettsMemberN/A
U.S. Court of Appeals, First CircuitMemberN/A
Publication nameTitleDate
Boston Injury Attorneys BlogSelected Topics, Massachusetts Personal Injury2013
Boston Injury Attorneys BlogSelected Topics, Massachusetts Personal Injury2012
Boston Injury Attorneys BlogSelected Topics, Massachusetts Personal Injury2011
Boston Injury Attorneys BlogSelected Topics, Massachusetts Personal Injury2010
School nameMajorDegreeGraduated
Suffolk University Law SchoolLawJD - Juris Doctor1992
Boston College Law SchoolMathematics, Cum LaudeBA - Bachelor of Arts1989
Speaking engagements
Conference nameTitleDate
Stewards Safety Meeting, New England Carpenters Local 26What If You Are in A Serious Accident2014
Featured Speaker, LABORERS INTERNATIONAL UNION OF NORTH AMERICA LOCAL 151Serious Personal Injuries2013