A native of Cheyenne, Wyoming, and the daughter of an Army colonel and his wife, Hart moved to New York City to pursue an acting career. She appeared on Broadway in Tom Stoppard's play, Dirty Linen and New-Found-Land from January-March 1977, winning the 1977 Theatre World Award. She appeared on Broadway in The Heiress (1976) and Design for Living (1984), and in Othello as a replacement "Desdemona" in March 1982. Hart starred opposite Paxton Whitehead in five plays before appearing together in Bedroom Farce at the Westport Country Playhouse in 2015. The production ran from August 25, 2015 through September 13, 2015.