[4] Casarosa was born in Genoa, Italy, but moved to New York City in his twenties, to study animation at the School of Visual Arts and Illustration at the Fashion Institute of Technology.

[5] Before joining Pixar, he worked as a storyboard artist at Blue Sky Studios on Ice Age and Robots.

[6] In late 2004, Casarosa started a drawing marathon community called SketchCrawl and has been organizing the event ever since.

[9][10] Casarosa most recently directed the Pixar Animation Studios film Luca, released on Disney+ on 18 June 2021, in the United States.

[24] This initiative also produced a corresponding art book reprinting the various pieces contributed and included the likes of James Jean, Charles Vess, Iain McCaig and William Joyce among others.