Tress MacNeille (character)

Tress MacNeille is a voice actress.

History
After Lisa sees Bart's affection for Lou, she tries to trick him into being a vegetarian by playing mooing sounds on a CD by Tress MacNeille. Later when Homer was at the Slaughter House, she was the voice recording in the building.

Behind the Laughter

 * In reality, Tress MacNeille is the voice of many characters on The Simpsons, having been working with the show since the first season, and having been in every episode since 2001.