Alfred Weiss / Head of Inkwell Studios, Weiss began releasing sound cartoons in 1929, with soundtracks recorded at Metropolitan Studios. Some were reissues of silent Inkwell cartoons with newly added soundtracks.
Max Fleischer / The silent KoKo films were extensions of the first animated films in which live action artists would bring drawings to life, implementing another of Fleischer's inventions, the Rotograph. The Rotograph was a system for combing live action and animation.
The Fleischer Brothers went on to produce many memorable characters utilizing other techniques they invented, including Betty Boop and Popeye.