Siff was born in The Bronx, New York City. Her father is Jewish (from a family from Russia), and her mother is of Irish and Swedish descent; she has said that she feels "culturally Jewish". She is an alumna of The Bronx High School of Science and of Bryn Mawr College, where she majored in English and graduated in 1996. She later completed an M.F.A. in acting at New York University\'s Tisch School of the Arts Graduate Acting Program.. Shortly after graduating, Siff also worked as a temp at a hedge fund, an experience she drew on for her role in Billions.\n', '

Siff worked extensively in regional theater before acting in television. She won a Barrymore Award for Excellence in Theater in 1998 for her work in Henrik Ibsen\'s Ghosts at Lantern Theater Company.\n', '

Siff started appearing in television series in 2004. She appeared as an Alcoholics Anonymous speaker during an episode of Rescue Me in Season 2. She also had roles on Law & Order: Special Victims Unit, Grey\'s Anatomy, and Law & Order.\n', '

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