Mary Gibbs

Mary Gibbs is an former child actress who is best known for voicing Boo in the 2001 Disney/Pixar film Monsters, Inc.. She also voiced Sha-Ron in Mulan II (2004). She is the daughter of story artist Rob Gibbs.
Having been two years old at the time of filming for Monsters, Inc., the crew found that Gibbs was unable to sit still in the recording booth, and so they followed her around the studio with a microphone to record her dialogue.