Horovitz was born to Doris Horovitz (née Keefe) and playwright Israel Horovitz and raised in Manhattan, New York.
Born as Gillian Adams she is married to American screenwriter Israel Horovitz, author of more than 50 produced plays.
The Boston production is sometimes described as the longest-running or second-longest-running non-musical play in the world, although various non-musical plays have run for longer: Agatha Christie's The Mousetrap in London since 1952, Eugène Ionesco's The Bald Soprano in Paris since 1957, and Israel Horovitz's Line in New York City since 1974.
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