Zosia Mamet net worth: Zosia Mamet is an American actress who has a net worth of $3’000’000. Born February 2, 1988, in Randolph, Vermont, she is best known for her roles in the wildly popular AMC television series Mad Men, the television series Parenthood and as Shoshanna Shapiro on the HBO series Girls. Zosma (pronounced ZAH-she-like Sasha with a Z) is the daughter of American playwright, screenwriter, and film director David Mamet and actress Lindsay Grouse. Her maternal grandfather is the late Russel Grouse, and one of her maternal great-grandfathers is the late educator John Ermine. One of her half-siblings, Clara, is also an actress. Zosma lived in New England until age five, when her mother moved to Pacific Palisades, California, taking Zosma and sister Willa with her. After finishing high school, Zosma made the decision to pursue acting instead of going on to college.