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Clark chose acting as her profession and began to study acting after graduating from Mount Holyoke College. In 1975, she starred in "Who Killed Amy Lang", which aired on Good Morning America. She also performed in Wendy Wasserstein's play "Uncommon Women". She played the lead in the film A Cry In The Night, based on a novel by her mother.
Clark's New York apartment building, The Belaire, was hit by a small plane on October 11, 2006 flown by New York Yankees pitcher Cory Lidle. Her 38th floor condominium was just a floor below the main impact zone; she was not at home during the accident. Clark has appeared on the game show To Tell The Truth.