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Zosia was born February 2, 1988 in Randolph, Vermont. She is the daughter of American playwright, essayist, screenwriter, and film director David Mamet and actress Lindsay Crouse. Her maternal grandfather was playwright Russel Crouse. Zosia's half-sister Clara Mamet is also an actress.
After finishing high school, Zosia decided to pursue acting instead of going to college. "I was horrifically unhappy. I love learning and I was always a very good student because I hated not doing well. But I had some extreme social anxieties. I never really got along with kids my age. I was a bit of a precocious child. I could go with my dad to a party full of famous Hollywood individuals and be fine. But put me in a room with a bunch of other 17-year-olds and I would stand in the corner, terrified."
In early 2013 she starred in the off-Broadway play Really Really and will appear in father David Mamet's adaptation of Anton Chekhov's Uncle Vanya at L.A. Theatre Works October 17-20, 2013. Zosia has also starred in Jez Butterworth's The Naked Eye and performed and written pieces for 24 Hr. Plays and Glamour magazine's "These Girls" at Joe's Pub.