Maggie Siff (born June 21, 1974) is an American actress. She is best known for her television roles as department store heiress Rachel Menken Katz on the AMC drama Mad Men and Dr. Tara Knowles-Teller on the FX drama Sons of Anarchy. She also had a role in the 2009 film Push as Teresa Stowe, and one in the 2010 film Leaves of Grass as Rabbi Renannah Zimmerman.
Siff was born in Bronx, New York City. Her father is Jewish, and Siff identifies as half-Jewish. She is a graduate of The Bronx High School of Science, and of Bryn Mawr Majoring in English and graduating in 1996, and later New York University's Graduate Acting Program at the Tisch School of the Arts with an M.F.A. in Acting.
Siff worked extensively in regional theater before her work on TV. She appears as an Alcoholics Anonymous speaker during an episode of Rescue Me in Season 2. She won a Barrymore Award for Best Supporting Actress in 1998 for her work in Henrik Ibsen's Ghosts at Lantern Theater Company. She also had a brief role in Funny People.
Maggie Siff is expecting her first child with her husband. They know what the gender of the baby is, but are keeping it a secret for now.