She appeared in 26 episodes of Dallas and became fondly remembered by Full House fans as Claire Tanner, the grandmother of the Tanner family, appearing in two episodes. Hirson also played a significant role on the ABC sitcom Ellen from 1994 to 1998, portraying Lois Morgan, the title character’s mother. Her storyline coincided with Ellen DeGeneres’ historic real-life coming out in 1997, making the role particularly memorable.
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Throughout her career, Hirson made numerous guest appearances on popular shows including Murphy Brown, Just Shoot Me!, and The Secret Life of the American Teenager, as well as several daytime soap operas. She also appeared in films such as Private Benjamin, Revenge of the Nerds, and Being There.

Beyond television, Hirson had a respected stage career, appearing on Broadway in productions including Traveller Without Luggage, The Investigation, and Solitaire/Double Solitaire. She is remembered as a versatile performer whose work left a lasting mark on American television and theater.
Rest in peace.