Filmmakers John DiMaggio, Tommy Reid and Lawrence Shapiro are putting finishing touches of their documentary feature I Know That Voice, a valentine to the Hollywood voice acting community. The film features interviews with Matt Groening, Hank Azaria and Nancy Cartwright (of The Simpsons), Tom Kenny (Sponge Bob Sqaurepants), Billy West (Ren & Stimpy, Futurama), Stephen Root (King of the Hill), June Foray (Rocky, Witch Hazel), Tara Strong (My Little Ponies, PowerPuff Girls), Seth Green (Family Guy), Laraine Newman (Finding Nemo), voice director Andrea Romano, Mark Hamill (The Joker), EG Dailey (Rugrats) – and many others. It’s being prepped for theatrical release in 2013 – here’s the trailer: