TV Article Maggie Siff pregnant with first child By Jake Perlman Published on October 28, 2013 10:36PM EDT Sons of Anarchy actress Maggie Siff is pregnant. A rep for the actress confirmed to People that she and her husband are expecting their first child. Siff, 39, is best known for playing Dr. Tara Knowles-Teller on the hit FX series and department store heiress Rachel Menken Katz on the first season of Mad Men. News of Siff’s pregnancy was first reported after the actress had to withdraw from on an upcoming play in New York.