American screenwriter, actor, and producer for film and television. As a writer and storyboard artist for such animated television shows as SpongeBob SquarePants, Camp Lazlo, Phineas and Ferb, The Marvelous Misadventures of Flapjack, Adventure Time and Regular Show, he has received multiple Emmy Award nominations and has won twice for Adventure Time. He is currently the head writer for Cartoon Network's upcoming series Summer Camp Island, set to premiere in 2018. He has also starred in several mumblecore films, including Hannah Takes the Stairs, Nights and Weekends, All the Light in the Sky and Uncle Kent. His brother is the director Mark Osborne.