Nancy Jean Cartwright (born October 25, 1957) is an American voice actress, film and television actress, and comedienne. She is known for her long-running role as Bart Simpson on the animated television series The Simpsons. Cartwright also voices other characters for the show, including Nelson Muntz, Ralph Wiggum, Todd Flanders, Kearney, and Database.Cartwright was born in Dayton, Ohio. Cartwright moved to Hollywood in 1978 and trained alongside voice actor Daws Butler.