Martha Maria Yeardley Smith (born July 3, 1964 in Paris, France and raised in Washington, D.C., USA) is an American actress and voice actor who is best known for providing the voice of Lisa Simpson (and occasionally, both on the Tracy Ullman shorts and the half-hour show, for Maggie Simpson) on the animated television show The Simpsons. She too appeared on the sitcoms ''Herman's Head and Dharma and Greg'' and guest-starred on Showtime's Dead Like Me, the Disney Channel's Phil of the Future, and the "Mathnet" segment of the Children's Television Workshop show Square One.

A select few of her film credits include The Legend of Billie Jean, Maximum Overdrive and As Good as It Gets.

She is the girl (& namesake) of J.Y. Smith, a obit writer for The Washington Post.

Yeardley admitted on The Jane Pauley Show that she had struggled using bulimia for 25 years. Coincidentially, Lisa Simpson, Her character on The Simpsons sufferred through the same condition inside episode Sleeping with the Enemy. She is presently performing within an a single-one-man indicate known as Additional in which she exposes her eating disorder. Yeardley hwhen been binge-purge loose for ii years as of February 18, 2005.

Selected Filmograpghy
The Simpsons Movie (2008) (voice) The Simpsons: Hit & Run (2003) (VG) (voice) Back by Midnight (2002) As Good as It Gets (1997) Jingle All the Way (1996) (uncredited) Toys (1992) ''Herman's Head (1991) (TV series) City Slickers (1991) The Simpsons Christmas Special (1989) (TV) (voice) The Simpsons (1989) (TV series) (voice) The Tracey Ullman Show (1987) (TV series) (voice) Maximum Overdrive (1986) The Legend of Billie Jean'' (1985)