Her father, J.Y. Smith, who died in 2006, was a longtime obituary writer for The Washington Post. (imdb.com)
Of the core 6 Simpsons performers, Yeardley is the youngest. (imdb.com)
Is only one of two actresses (the other being Marcia Wallace) on "The Simpsons" (1989) to regularly play only one character. All of the other actors play ten or more characters. (imdb.com)
Her name is pronounced "Yard-lee". (imdb.com)
Originally read for the role of Bart when auditioning for "The Simpsons" (1989), but her voice was too high and sounded like a girl, so she lightened her voice up a little and auditioned and won the role of Lisa. Ironically, Nancy Cartwright originally read for Lisa, but was given the role of Bart. (imdb.com)
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