Although Walt Disney was the public face of the animation studio that bore his name, much of the behind-the-scenes work was done by head animator Ub Iwerks. This biography by Iwerks' granddaughter, filmmaker Leslie Iwerks, details the animator's many contributions to Disney's studio, including creating the first cartoon superstar, Mickey Mouse, and perfecting the process that merges animation and live-action film, which went on to become a staple of Disney's film and TV work.