Tina Fey is a actress, comedian, writer and producer, known for her work
on the NBC comedy  series Saturday Night Live, the series 30 Rock also
on NBC. Fey first broke into comedy as a featured player in the Chicago-
based improvisational group The Second City. She later joined Saturday
Night Live as a writer, becoming head writer and a performer, known for  
her role as co-anchor in the Weekend Update segment (shown below).

Tina Fey (left) as Sarah Palin in SNL sketch with Amy Poehler.

Tina Fey at the Saturday Night live WEEKENDUPDATE desk.