Nancy Jean Cartwright (born on the 25th of October, 1957) is an American voice actress, movie and TV actress and comedienne. She is well-known worldwide for giving Bart Simpson of The Simpsons his voice. Cartwright is also the voice of several other characters of the show: Nelson Muntz, Ralph Wiggum, Todd Flanders etc. First Cartwright's works are Gloria's voice in the Richie Rich animated series and Marian Rose White TV film.