About Kevin John
Kevin John Mahoney earned his J.D. from New England Law | Boston in 1989. He entered the profession at a time when courtroom experience often came first and theory followed. Law school gave him the credential. Early hands-on work shaped his approach.
His first professional posting was as a judicial law clerk at the Superior Court in New Haven, Connecticut, where he served in 1989. The clerkship placed him close to trial calendars and the mechanics of court rulings. It was a formative year that exposed him to a steady stream of motions, hearings, and written opinions.
In 1991 he joined the Middlesex County District Lawyer's Office as an assistant district lawyer. That role put him on the other side of the courtroom. He prosecuted cases, managed dockets and learned how evidence and procedure affect outcomes. The experience also offered sustained courtroom time, sharpening trial instincts and case management skills.
Two years later, in 1993, he moved into private practice as a partner at Mahoney Criminal Defense Group. That transition returned him to criminal defense work. As a partner he has handled a range of matters at the state level and in federal proceedings. The practice reflects years spent on both sides of the aisle and a familiarity with the rhythm of criminal litigation.
Mahoney is admitted to practice in New York and Massachusetts and before the U.S. Court of Appeals for the First Circuit. He is a member of the National Association of Criminal Defense Lawyers and the Massachusetts Association of Criminal Defense Lawyers, both memberships dating from 1995. Those affiliations place him in a network of attorneys who focus on criminal law and appellate procedure.
Peers and clients have known him for methodical preparation and a willingness to take cases to trial when necessary. He has handled preliminary hearings, bench trials and jury trials, and he appears in motions practice at both the trial and appellate levels. His background as a prosecutor informs his defense work; having seen how cases are built, he looks for procedural and evidentiary weak points his team can press.
He maintains a practice that spans state and federal matters, drawing on nearly four decades of courtroom experience. He focuses his current practice on criminal defense matters in Massachusetts and on appeals and federal litigation before the First Circuit.
