Peter John Hannan is an American producer, animator, singer-songwriter and author. Hannan is the creator, executive producer, and showrunner of the Nickelodeon series CatDog, for which he also wrote and sang the theme song. He is the story editor, sometime songwriter, and interstitial producer of the animated PBS Kids series Let's Go Luna!. He created a web series called ''Really Freaking Embarrassing. His single-panel cartoons The Adventures of a Huge Mouth'' ran in independent newspapers and magazines in Harper's, Esquire and others. He writes and illustrates books, including Petlandia, My Big Mouth: 10 Songs I Wrote That Almost Got Me Killed, The Greatest Snowman in the World, Super Goofballs, Sillyville or Bust, Escape from Camp Wannabarf, School After Dark: Lessons in Lunacy, The Battle of Sillyville: Live Silly or Die! And ''Freddy! King of Flurb''. He co-founded the company FutureVision, which produced a TV concert series featuring blues artist Muddy Waters, Albert King, Buddy Guy & Junior Wells, Bobby Bland, Otis Rush, and Blind John Davis. Hannan has taught, lectured, and led art, writing, animation, and creativity workshops for pre-school through college students. He has worked as a graphic designer and art director and created illustrations for magazines, newspapers, and advertising. He exhibits paintings, illustrations, and cartoons.

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