Hart first worked as a journalist and at the Gorham Silver Company before becoming seriously interested in acting through a summer theater in Tiverton, Rhode Island. He was holidaying in the town and heard they needed a male juvenile. He got the job and decided to become an actor. Early in his career, "Hart earned as he learned by appearing in radio soap operas." Hart gained early experience with the Providence Players. He appeared opposite Constance Bennett in a production of Without Love. He also performed with the Shoestring Players in Rhode Island. At Provincetown he was in Only the Heart by Horton Foote.
Broadway
Hart went to New York to study with Tamara Daykarhanova's School for the Stage. He appeared on Broadway in Pillar to Post, which ran 31 performances. Hart's big break came when, as resident juvenile in a summer theater at the Brattle Playhouse in Cambridge, Massachusetts, he played John, the lead role in a new play trying out there, Dark of the Moon. The Shuberts took it to Broadway, keeping little of the original company except Carol Stone and Hart, who went on to win a Theatre World Award for his debut. A Broadway run of 318 performances then led to a national tour and a contract for Hart with Metro Goldwyn Mayer.
MGM
Hart made his film debut in Desire Me where he appeared alongside Greer Garson and Robert Mitchum. Hart replaced Robert Montgomery in his role after that actor quarrelled with George Cukor. The movie had a troublesome production; after poor previews almost half of it was reshot. In between the original film and the reshoots Hart appeared in Green Dolphin Street, where he was loved by two sisters, played by Lana Turner and Donna Reed. Hart's third film for MGM was B.F.'s Daughter, as the jilted first love of the title character, played by Barbara Stanwyck. He went over to Eagle-Lion Productions to appear in Reign of Terror, a Walter Wanger production set during the French Revolution directed by Anthony Mann.
Return to Broadway
Hart left MGM to go back to the stage. Back on Broadway he appeared in a flop, Leaf and Bough , then in April 1949 took over for Sam Wanamaker in Goodbye, My Fancy which ran for 446 performances in all. Hart had a hit as the original Uncle Desmonde in The Happy Time opposite Claude Dauphin and Eva Gabor which ran 614 performances. Hart had to leave the show during its run because of his TV commitments.
Television
While acting on Broadway, Hart was busy in television. He appeared in episodes of The Philco-Goodyear Television Playhouse, The Clock, Fireside Theatre, The Ford Theatre Hour, The Silver Theatre, Masterpiece Playhouse,, Studio One in Hollywood. In October 1950 Hart began playing Ellery Queen in the DuMont Television Network series The Adventures of Ellery Queen — the first to do so on TV. Lee Bowman took over the role when Hart died.
Personal life
Hart married his teenage sweetheart, Eugenia Getchell, in 1938, and had one son, Christopher. His desire to work in New York City led to a divorce from his wife, who chose to stay in Providence with their son in 1941. He later married actress Louise Valery, whom he had met in Dark of the Moon, and they had two daughters, Hillary and Sheila. While he was estranged from Louise, "reportedly, in 1947, a son, Richard Lee Hart, was born out of wedlock with Phyllis Eileen Buswell." He was said to have lived with actress Felicia Montealegre during his last four years of life.
