About John L. Calcagni
John L. Calcagni III is a lawyer by training who moved quickly into military and federal practice. He completed a Bachelor of Science in Finance and Law at Bryant College in 2000, earned his J.D. from Roger Williams University School of Law in 2003, and attended the U.S. Army Judge Advocate General’s Legal Center and School in 2004 for military law training. The mix of civilian legal education and military legal schooling shaped his early work.
Calcagni began his professional life in public service. In 2004 he served as a Special Assistant U.S. Attorney for the Northern District of New York and that same year worked as a military prosecutor in the U.S. Army. Those roles placed him inside federal courtrooms and military justice proceedings, often handling cases that required quick adaptation to different procedural regimes. He later joined the U.S. Army Reserves’ Judge Advocate General’s Corps in 2008, adding reserve duty to a growing civilian practice.
In 2009 Calcagni opened his own firm, Law Office of John L. Calcagni III, Inc., and has run it since. The private practice allowed him to take on a broad range of matters. He has admitted to practice in multiple state bars and federal courts, including Rhode Island and Massachusetts, New York, Connecticut, and Florida, the U.S. Supreme Court, the U.S. Court of Appeals for the Armed Forces, and several U.S. district courts across the country. That admission pattern reflects steady expansion from state to federal and appellate work.
His memberships show a deep engagement with criminal defense circles and federal practice groups. He belongs to the National Academy of Criminal Defense Lawyers, the National Association of Criminal Defense Lawyers, the Federal Court Bar Association, and several state and local bar organizations. Those affiliations mirror the mix of trial work, appellate advocacy, and military law he has handled over two decades.
Clients and colleagues describe a lawyer who moves between practice areas rather than staying in a single lane. He has experience prosecuting and defending cases, and he has worked on matters that required appeals and federal filings. The military background gives him familiarity with court-martial procedure and appellate practice before military courts. His civilian admissions cover trial and appellate venues in multiple states and several federal districts.
Calcagni continues to practice through his firm. He handles criminal defense, federal litigation, appellate matters, and military justice cases as part of his current practice focus.
