From 1992 until 1996, as the last president of the Hanna-Barbera cartoon studio, Seibert was able to reinvigorate the company's creative reputation with the establishment of the animation incubator "What a Cartoon!". Modeled on the Golden Age of mid-20th century cartoons, the 48 short films from creators around the world, Hanna-Barbera was able to launch seven hit series after a dry spell since the launch of the Smurfs in 1981 for NBC. The shows included Genndy Tartakovsky's "Dexter's Laboratory", David Feiss' "Cow and Chicken" and "I Am Weasel", Van Partible's "Johnny Bravo", John R. Dilworth's "Courage the Cowardly Dog", and Craig McCraken's "The Powerpuff Girls".