Brian J.S. Cullen

Brian J.S. Cullen is a trial attorney with Cullen Collimore Shirley PLLC whose practice centers on complex civil litigation in New Hampshire and Massachusetts. He handles disputes involving trade secrets, consumer protection, employment, civil rights, business relationships, and other high-stakes claims. A former prosecutor, he has extensive courtroom experience in state and federal courts and regularly tries civil cases before juries. His work includes matters where liability, damages, witness credibility, business records, and complicated legal issues require detailed preparation and focused trial strategy.

Cullen earned a B.A. from Bates College and a J.D., magna cum laude, from Villanova University School of Law. His legal education was followed by government and private litigation work that developed substantial courtroom experience. The combination of academic training and trial practice supports his ability to analyze complex factual records, examine witnesses, prepare motions, and present legal arguments clearly. Those skills are central to civil cases involving business competition, constitutional claims, employment disputes, and other matters with significant financial or reputational consequences.

Cullen previously served as a prosecutor and became Chief of the Narcotics Unit in the Suffolk County District Attorney’s Office in Boston. In civil practice, he has handled more than thirty civil jury trials during the past decade, including numerous federal trials. Representative matters include defending a company president in trade secret and unfair competition litigation, representing police officers in civil rights cases, defending investors in Ponzi-scheme clawback litigation, and representing employers in age, gender, and disability discrimination disputes.

Brian J.S. Cullen is a Fellow of the American College of Trial Lawyers, reflecting significant experience as a courtroom advocate. He has also contributed to community service, including several years as a director of the Nashua Soup Kitchen and Shelter. His work combines prosecutorial experience, private civil litigation, and repeated jury trial practice. Clients facing complex disputes benefit from his ability to evaluate evidence, prepare witnesses, manage trial strategy, and present contested legal and factual issues in state and federal courts.

Law Office Affiliations

• Attorney, Cullen Collimore Shirley PLLC
• Member, New Hampshire Bar Association
• Fellow, American College of Trial Lawyers
• Director, Nashua Soup Kitchen and Shelter

Licensed State

• New Hampshire

Education

• Villanova University School of Law
  Juris Doctor (JD)
• Bates College
  Bachelor of Arts (BA)

Awards & Badges