"The Simpsons Voices: Nancy Cartwright
Nancy Cartwright does the voice of Bartholomew "Bart" Jo-Jo Simpson as well as the voices of Nelson Muntz, Todd Flanders, Ralph Wiggum, and Kearney on "The Simpsons". She started doing the voice of Bart on "The Simpsons" when it first premiered on "The Tracy Ullman Show" in 1987. When the show was picked up by FOX and became a big hit she remained on the show and still does Bart's voice today, and hopefully she will be on the show for many years to come.