Peter Browngardt

Peter Pete Browngardt is an American cartoonist, storyboard artist, writer, voice actor, and producer, who is best known for being the creator of Cartoon Networks Uncle Grandpa, in which he also voices the titular character, and its early spinoff Secret Mountain Fort Awesome. Browngardt has had prior experience working on shows such as Futurama, Chowder, and The Marvelous Misadventures of Flapjack. His main contribution to the Adventure Time series is storyboarding and writing the episode Wizard.

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Source: Wikipedia