Zosia Mamet makes her stage debut in Paul Downs Colaizzo’s off-Broadway drama Really Really. The daughter of playwright David Mamet, Zosia is best known as Shoshanna Shapiro on the HBO series Girls. She also appeared on the TV shows Mad Men, Parenthood and The United States of Tara. Her film credits include The Kids Are All Right, Cherry, Off the Ledge and The Last Keepers.