Sara Gilbert is an American actress, director, and producer best known for her role as Darlene Conner on the ABC sitcom 'Roseanne' and its spin-off series 'The Conners'. She also portrayed Leslie Winkle on the CBS comedy series 'The Big Bang Theory'. Gilbert has been playing the role of Darlene Conner since 1988, making her one of the longest-running characters on television. Gilbert has also received critical acclaim for her work as a producer and director, having directed episodes of 'The Conners' and 'The Big Bang Theory'.