John Semper Jr. is an African-American screenwriter, producer and story editor with numerous credits in animation for television. He has worked for miscellaneous companies as Walt Disney Studios, Warner Bros. Animation and Hanna-Barbera Productions during a career which has involved the development of projects for Jim Henson, George Lucas, Stan Lee, Rob Minkoff and others. Semper created the English-language dialogue for two of Hayao Miyazaki's anime feature films Castle in the Sky and Kiki's Delivery Service, and co-wrote the screenplay for the live-action comedy Class Act.