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 roles in the films Push (2009) as Teresa Stowe and Leaves of Grass (2010) as Rabbi Renannah Zimmerman.