John Gillen

John Gillen is a Hampton, New Hampshire trial lawyer whose work includes personal injury and criminal defense matters. He has tried hundreds of criminal and civil cases in District, Superior, and Federal Courts in New Hampshire and Massachusetts. His court appearances are concentrated in Rockingham County, New Hampshire, and Essex County, Massachusetts, while his practice also extends to courts across eastern Massachusetts and southern and central New Hampshire.

John’s education includes Merrimack College in North Andover, Massachusetts, and Suffolk University Law School in Boston. His professional preparation was followed by admission to the Massachusetts Bar in 1978, the Federal District Court of Massachusetts in 1979, the New Hampshire Bar in 1984, and the United States District Court of New Hampshire in 1984. This background supports a litigation practice spanning state and federal courts in two states.

John previously served as an Essex County, Massachusetts Assistant District Attorney, giving him prosecution experience before building a long trial practice on the defense and civil sides. He has handled a large volume of courtroom matters over several decades. His work involves evaluating facts, preparing cases for court, and representing clients through the procedural demands of criminal cases and civil disputes, including personal injury matters.

John Gillen has served as an Essex County Superior Court Conciliator since 1994. He is a member of the New Hampshire Trial Lawyers Association, the New Hampshire Association of Criminal Defense Lawyers, and the Massachusetts Academy of Trial Attorneys. His combination of prosecution experience, trial work, conciliation service, and multistate admissions supports a practice focused on courtroom representation for people facing criminal charges or civil claims.

Law Office Affiliations

• Attorney, John Gillen Law
• Member, Massachusetts Bar Association
• Member, New Hampshire Bar Association
• Conciliator, Essex County Superior Court (1994-Present)
• Member, New Hampshire Trial Lawyers Association
• Member, New Hampshire Association of Criminal Defense Lawyers
• Member, Massachusetts Academy of Trial Attorneys
• Member, The 100 Club of New Hampshire
• Member, The Appalachian Mountain Club
• Member, The Surfrider Foundation

Licensed State

• Massachusetts
• New Hampshire

Education

• Suffolk University Law School
  Juris Doctor (JD)
• Merrimack College
  Bachelor’s Degree

Awards & Badges