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-sibling 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."

She has also played recurring characters in Mad Men, Parenthood, United States of Tara, and The Unit.

Zosia has appeared in several movies including The Kids Are All Right (2010), Cherry (2010), Sunset Stories (2012), The Last Keepers (2012), and Rhymes With Banana (2012). See her Acting Bio for a complete list. On stage, Zosia has 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.

Zosia has been in several online shorts such as Snuggle Bunny: Man's Most Lovable Predator and Miss USA's Sexy Halloween.

In 2012 she starred in the music video for "Unconsolable" by Ambassadors and has also formed a band, The Cabin Sisters, with her half-sister Clara.

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