Mary Gibbs

Mary Gibbs (born October 5, 1996) is an American actress who was known for voicing Boo in the 2001 Disney/Pixar film Monsters, Inc.. She also voiced Baby Kiara in The Lion King II: Simba's Pride (1998) and Sha-Ron in Mulan II (2004). Archive recordings of her cries and screams were re-used for toddler-age Riley Andersen in ''Inside Out. the voice of Goat in The Rugrats Movie''

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.