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He worked on television cartoons and commercials for several studios, including Kennedy Cartoons in Toronto and Colossal Pictures in San Francisco before joining Pixar in June 1996.
Beginning his professional animation career with Sally Cruikshank in 1978, Bertino has worked for Nepenthe, DiC, Hanna-Barbera and Colossal Pictures in a number of capacities including character design, storyboards, layouts, voices and sound effects.