Nancy Cartwright is an American actor and voice actor, is best known as the voice of spiky-headed underachiever Bart Simpson. She has started her career as a voice actor since then has also served as an actor in several films. Her major breakthrough came with the film The Simpsons, which she has received the Primetime Emmy award. Her other notable films include The Simpsons Movie, The Replacements and Kim Possible. Her upcoming film include Captain Underpants.