Saturday Night Live
A Second City alum, Fey joined SNL as a writer in 1997 and two years later became the show's first-ever female head writer. In 2000, she started co-anchoring Weekend Update with Jimmy Fallon before Amy Poehler joined her in 2004 to form the first all-female WU anchor team. Fey, who nabbed an Emmy for writing SNL, left in 2006 to launch 30 Rock. She returned in 2008 to parody Sarah Palin, for which she won a guest-actress Emmy.