Robert S. Sinsheimer

Founder & Attorney

Founder Robert S. Sinsheimer first opened his doors in 1990. Attorney Sinsheimer and his Firm are known in Boston for the very highest degree of personal service. Rob brings unparalleled perseverance to his cases, a quality which moved a local newspaper to describe him (for better or worse) as a “pitbull.” Rob brings these qualities to an unusually broad array of litigation issues and strategies.

In 1984, Rob joined the Law firm of Gilman, McLaughlin, and Hanrahan. As a senior associate, he concentrated in personal injury and white-collar criminal matters. During that period, he was also introduced to business litigation.

In 1987, Rob joined Dangel and Sherry, a firm concentrated in catastrophic products liability and toxic torts. While Rob developed expertise in products liability, he simultaneously continued to diversify his litigation practice, with a continued focus on complex personal injury, civil rights, and criminal defense. In 1998, Rob was co-counsel on a team that prosecuted the civil rights case of Michael Cox, an African American police officer who had been beaten by fellow officers. The case was a resounding success and was later memorialized in a book called “The Fence” by Dick Lehr (Harper Collins, 2009).

In 2002, Rob defended an individual charged with 36 counts of mail fraud and mortgage fraud in Federal Court in the Southern District of New York. After a seven-week jury trial, his client was completely exonerated, a rare occurrence in high-level federal prosecutions. Rob was also instrumental in obtaining a judgment and seven-figure settlement for an individual beaten by Boston Police Officers.

In 2019, Rob spearheaded a team of five lawyers that won $36,000,000.00 before a Plymouth County jury. Read more about it here.

He obtained the largest verdict of the year in 2019 in the Commonwealth of Massachusetts.

Rob attended the Brooks School and then Dartmouth College, where he majored in government. He received his J.D from Suffolk University Law School. In 1979, he won the prestigious Tom C. Clark Moot Court competition. He taught briefly at Suffolk University Law School before joining the District Attorney’s Office. Rob is currently an adjunct professor at Suffolk University Law School, teaching Massachusetts Civil Litigation Practice. He has also taught at Boston University School of Law. Rob has served as President of the Frank J. Murray Inn of Court, an organization of Judges and Lawyers devoted to enhancing and increasing civility in civil litigation. He is a member of The Boston Bar Association, the Massachusetts Bar Association, the Association for Justice, the Frank J. Murray Inn of Court, and the Massachusetts’ Association of Criminal Defense Attorneys.


  • M.C.L.E., Cost Effective Discovery Tools, Adjunct Professor, Teaching
  • Massachusetts Civil Litigation Practice, Suffolk University Law School


  • Federal Bar Association
    • Massachusetts Board of Directors
      • National Civil Rights Committee Membership Chair
  • President, Frank J. Murray Inn of Court, 2001 – 2002
  • Treasurer, Frank J. Murray Inn of Court, 2000 – 2001
  • American Association for Justice Member
  • The Boston Bar Association Member
  • Massachusetts Bar Association Member
  • Massachusetts Association of Criminal Defense Attorney


  • Plymouth County District Attorney’s Office, Prosecutor
  • Gilman, McLaughlin, and Hanarhan
  • Dangel and Sherry
  • Denner O’Malley, LLP, Partner


  • Massachusetts
  • United States District Court for the District of Massachusetts
  • First Circuit Court of Appeals


  • Suffolk University Law School Boston, Massachusetts
    • Honors: Tom C. Clark
    • Moot Court Competition
  • Dartmouth College
    • Major: Government
Peter R. Cruice

Associate Attorney

Peter R. Cruice joined the firm as an associate in 2019. He has been a member of the Massachusetts Bar and the United States District Court of Massachusetts since 2019.  While in law school, Peter spent his first-year summer and the fall of his second-year working for the Suffolk County District Attorney as an intern. During his second-year summer, Peter was an SJC Rule 3:03 student prosecutor.  Peter has also clerked at multiple civil litigation firms.

Peter earned his Bachelor of Arts degree from Hobart College in 2013, where he was a Statesman Scholar-Athlete. Peter graduated from Suffolk University Law School in 2018 with an award in Pro Bono. At Suffolk, he was a member of the Journal of High Technology.

Professional Associations and Memberships

  • Massachusetts Bar Association
  • Boston Bar Association
  • Federal Bar Association
    • Civil Rights Section
  • Massachusetts Academy of Trial Attorneys

Past Employment Positions

  • James E. Neyman & Associates
  • Smith & Brink, P.C.
  • Suffolk County District Attorney’s Office

Bar Admissions

  • Massachusetts
  • United States District Court for the District of Massachusetts


  • Suffolk University Law School- Boston, Massachusetts
    • Awards: Pro Bono
    • Journal of High Technology- Member
  • Hobart College
    • Major: Writing & Rhetoric
    • Minor: Public Policy (Law Concentration)