Walsh was born in
San Francisco,
California. He had three siblings: Christopher, Patricia, and Mary. After graduating from the University of Rhode Island in 1967, Walsh worked briefly as a
VISTA volunteer in
Newport, Rhode Island organizing tenants for the United Tenant Organizations of Rhode Island (UTO) before resigning to pursue his acting career. Prior to becoming an actor, he also worked as a barman, an encyclopedia salesman, a junior high school teacher, a gymnasium equipment salesman, and a reporter. In 1974, he was discovered by a theater director and began working in
off-Broadway shows, where he began using the initials "J. T." to avoid confusion with another stage actor named James Walsh. ==Career==