Mary Gibbs was born in Pasadena, California, to Pixar director and story artist Rob Gibbs (1964–2020) and his wife Susan (née Hollands). One of the
production babies listed in the film credits of
Toy Story 2 (1999) is
Mary; Rob Gibbs was the story artist for that film. As Gibbs was a toddler at the time she was recorded as the voice of Boo in
Monsters, Inc., her parents helped the crew simulate scenarios that would elicit the required audio reactions that would be her lines; recording was difficult nevertheless because she would run all over the Pixar office. When Pixar's
Inside Out (2015) was in production, the audio recordings of Gibbs' screams as Boo were reused for baby Riley. Gibbs returned to voice acting in 2022, voicing the character of Janessa Jensen in the audio-drama series
Heroes of Extinction for Adventurous Ideas, LLC. In January 2022, Gibbs spoke on a panel at the Bakersfield Mouse-Con event about the project alongside other actors and producers of the series: Jason Braden,
Isaac C. Singleton Jr., Jerry Cornell, C. Andrew Nelson, and Joshua C. Shaffer. Gibbs has been documenting her life and time as Boo on her
YouTube channel,
Boo Grown Up. == Filmography ==