About John J.
John J. Costanzo built a varied academic foundation before entering the legal profession. He earned a Bachelor of Science in Psychology from Slippery Rock University of Pennsylvania, followed by a Master of Science in Counseling Gerontology from the same institution. He later received his Juris Doctor from Suffolk University Law School in 2010.
Those academic years informed a career that did not follow a single, straight line. Early professional work drew on his psychology and counseling training. He later turned to law, completing his legal studies and stepping into practice in the early 2010s. The combination of social science and legal education shaped an approach that pays attention to both technical detail and human factors.
After law school, Costanzo entered the bar and began practicing in New England. He holds membership in the Massachusetts State Bar and the New Hampshire Bar Association, both held since 2010. He has practiced under his own name and established a solo practice, which allowed him to manage cases directly and maintain a personal connection with clients.
Costanzo practices through John Costanzo Law. His work is anchored in serving individuals and small entities across the two-state area. He handles matters that require courtroom experience as well as transactional work, and he manages files from intake through resolution. His practice structure reflects the realities of small-firm work: direct client contact, hands-on file management and outside-the-office coordination when needed.
Colleagues and court records indicate a steady, steady-paced practice. Costanzo is active in the bar communities of both Massachusetts and New Hampshire, maintaining current memberships. That engagement keeps him connected to developments in court procedure and local practice norms. He has focused his continuing education and bar involvement on topics that support everyday litigation and counseling work in the regional context.
He now practices through John Costanzo Law, handling legal matters in Massachusetts and New Hampshire.
