Fast Facts

  • Her father was a stage actor in New York.
  • Began acting professionally in Philadelphia after graduating from nearby Bryn Mawr College, and won a Theatre Alliance of Greater Philadelphia Barrymore Award in 1998 for her supporting role in Henrik Ibsen's Ghosts.
  • Made TV debut in a 2004 episode of Third Watch and movie debut in the 2007 legal drama Michael Clayton.
  • Had a recurring guest role on the first season of Mad Men as department store heiress Rachel Menken.


  • 2007, Screen Actors Guild Awards — Outstanding Performance by an Ensemble in a Drama Series: Nominee
  • 2014, Critics' Choice Television Awards — Best Supporting Actress in a Drama Series: Nominee


  • Paul Ratliff — Husband


  • Bryn Mawr College, Bryn Mawr, Pennsylvania, United States (BA in English, 1996); New York University, Tisch School of the Arts, New York, New York, United States (MFA in Drama, 2004)

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  • Birth Name: Margaret Siff
  • Birth Place: Bronx, New York, United States
  • Profession: Actor

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