- Source of Wealth: Film, Television, Video Games, Music Videos, Podcasts
- Age: 55
- Birth Place: Paris, France
- Marital Status: Divorced (Daniel Erickson)
- Full Name: Martha Maria Yeardley Smith
- Nationality: American
- Date of Birth: July 3, 1964
- Ethnicity: English, Irish, German
- Occupation: Actress, Voice Actress, Writer, Comedian, Painter
Smith began her career in 1982, after she finished drama school. She joined the Arena Stage group as an apprentice and performed in several plays in DC, including their production of Peter Pan. She went to live in New York in 1984 and performed in the Broadway production The Real Thing, along with Jeremy Irons and Glenn Close.
In 1985, she made her film debut. This was went with roles in other films, such as Maximum Overdrive. She auditioned for Bart Simpson in 1987, but because of her voice, the director decided she should play Lisa instead. She has voiced Lisa from the start, and she has since had other roles in film and television. Her works include Louise in Herman’s Head, Marlene on Dharma & Greg and Penny in two episodes of Dead Like Me as well as City Slickers, Just Write, Toys and As Good as It Gets.