Mary Gibbs was born on October 5, 1996 in Pasadena, California, USA as Mary Jessica Gibbs. She is an actress, known for Die Monster AG (2001), Alles steht Kopf (2015) and Mike's Monstrous Adventure (2002).

Mary voiced the part of Boo, the toddler girl in Die Monster AG (2001). As she was only two-and-a-half at the time of filming, she had trouble sitting still to record her lines so the studio followed her around with a microphone.