No. There is no one lady that does ALL the voices of The Simpsons main characters.
Nancy Cartwright
Tress MacNeille
Matt Groening is the creator of the Simpsons and Nancy Cartwright does the voice for Bart Simpson along with the voices for Ralph Wiggum, Rod and Todd Flanders, Nelson Muntz and a few other various characters
Julie Kavner is a famous actress and voice personality. She provided voices for a few characters on the Simpsons. Julie Kavner was the voice for Marge Simpson, for example. She also provided the voice for Jacqueline Bouvier, Patty Bouvier, and Selma Bouvier.
They're professional voice actors, although some of the characters' voices have changed over time, Homer, Wiggum & Moe for example, so they aren't the same as when they started.
Nancy Cartwright
Tress MacNeille
Matt Groening is the creator of the Simpsons and Nancy Cartwright does the voice for Bart Simpson along with the voices for Ralph Wiggum, Rod and Todd Flanders, Nelson Muntz and a few other various characters
boob lady
Elenor Abernathy.
The Simpsons - 1989 Lady Bouvier's Lover 5-21 is rated/received certificates of: Argentina:Atp
Harry Shearer
Julie Kavner is a famous actress and voice personality. She provided voices for a few characters on the Simpsons. Julie Kavner was the voice for Marge Simpson, for example. She also provided the voice for Jacqueline Bouvier, Patty Bouvier, and Selma Bouvier.
She's provided voices for "The Simpsons" and "King of The Hill".
They're professional voice actors, although some of the characters' voices have changed over time, Homer, Wiggum & Moe for example, so they aren't the same as when they started.
She's known as Lunch Lady Doris
He does. He voices Alan Rickman and the Prime Minister in a 2013 episode.