As for 2016 C.H. Greenblatt has no plans to return to SpongeBob, due to his position with Harvey Beaks. Following the cancellation of the latter show, Greenblatt stated he kept an open mind on what could happen in the future, meaning that the chances of him returning to SpongeBob are not completely false. However, in April 2018, Greenblatt announced that he was now working in Warner Bros. Animation and developing a new show Jellystone!, thus ending any chance of Carl's returning to SpongeBob.
C.H. Greenblatt is an American cartoon screenwriter, producer, and storyboard artist. He has worked on SpongeBob SquarePants, and on the Cartoon Network series The Grim Adventures of Billy and Mandy. He is best known as the creator of Chowder, as well as of Harvey Beaks. He had attended the University of Texas at Austin where he majored in advertising, and got his first job in the animation industry working as a storyboard artist for SpongeBob SquarePants.
In November 2007, Greenblatt created Chowder, an animated show that he was the creator and executive producer of. He announced on his blog that Nickelodeon had given him a head-start for an 11-minute pilot of a new show that he had created, entitled Harvey Beaks. He announced in September 2013 that the show has since been picked up for 26 11-minute episodes, with the production commencing at the beginning of 2014.
He is quite well-known for his extremely off-model animation, especially in episodes like "Fear of a Krabby Patty."
Carl from the episode "Selling Out," whom Greenblatt voiced, is based on him.