Nancy Campbell Cartwright (born October 25, 1957 in Dayton, Ohio) is an American voice actress. She is best known for providing the voice of Bart Simpson, Nelson Muntz and Ralph Wiggum on the animated television show The Simpsons. She also provides the voice of Chuckie Finster on All Grown Up! instead of Christine Cavanaugh. A graduate of Kettering Fairmont High School, Cartwright attended Ohio University before transferring to UCLA where she earned a degree in theatre.

Awards
Cartwright actively supports many nonprofit organizations that help children, including Famous Fone Friends, Make-a-Wish Foundation, The Way To Happiness Foundation and World Literacy Crusade. She is co-founder of "Happy House", a non-profit organization dedicated to building better families. She is a member of Women in Film, ASIFA , Women in Animation and The Chouinard Foundation. Recently, Cartwright has become a contributor to ASIFA-Hollywood's Animation Archive Project.
In 2005 , an incorrect news story circulated that Cartwright had entered politics and been elected mayor of Northridge, California. In fact, Cartwright had been honored with the ceremonial title of "Honorary Mayor" by the Northridge Chamber of Commerce. Northridge is a neighborhood of Los Angeles and has no office of mayor.[1]
She is a member of the Church of Scientology,