Peter John Hannan (born August 13, 1954) is an American producer, animator, singer-songwriter, author, illustrator, artist, and entrepreneur. 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 has created and developed properties for numerous studios. He works as a character designer and writes for various other animated series. He has worked as a consultant on a variety of other shows. 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 throughout the U.S., Harper's, Esquire, and many 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 has written and illustrated newspaper and magazine pieces with titles like "The ... ()