Hirsch first started out as a writer and storyboard artist for The Marvelous Misadventures of Flapjack where he worked alongside and befriended fellow animators J.G. Quintel (who would go on to create Regular Show) and Pendleton Ward (who would go on to create Adventure Time).
J. G. Quintel has said that The Mighty Boosh was a large influence on his animated series The Regular Show.