Hilary Barta, Graham Annable, Gregg Schigiel, and Jacob Chabot, have contributed to issues of the comic. According to Jeff Lenburg, in his book Who's Who in Animated Cartoons, Hillenburg was co-writing and co-directing a second animated feature film based on Rob Zombie's comic-book series, The Haunted World of El Superbeasto, which was slated for a 2006 release. He helped to write Diggs Tailwagger, a 2007 pilot by Derek Drymon. Hillenburg stated in 2009 that he was developing two other television projects that he did not want to discuss. In 2010, he began working on Hollywood Blvd., USA, a new short film for animation festivals. In making the two-minute film, he videotaped people walking and animated them in walk cycles. Hillenburg said in 2012, "I hope to get [the film] done. It takes forever." He was aiming to finish it that fall. In 2013, three years after production began, Hollywood Blvd., USA was released to festivals. Hillenburg characterized it as a "personal film" and said that "it's not a narrative. It's just really about people in our town." Personal life In 1998, Hillenburg married Karen Umland, a Southern Californian chef who teaches at the New School of Cooking in Culver City. He deemed her the funniest person he knew, and the character of Karen Plankton was named after her. Also in 1998, their first and only child, son Clay, was born. Hillenburg formerly resided in Hollywood and Pasadena, and lived with his family in San Marino, California until his death. His hobbies included surfing, snorkeling, scuba diving, swimming, and performing "noisy rock music" on his guitar. He jammed with his son, who is a drummer, which Hillenburg called "a great way to bond with each other." He also enjoyed birdwatching at home, but said that he was always "an ocean freak". He was known informally as "Steve" among his family, friends, and fans. According to his colleagues, he was "a perfectionist workaholic", and was also known for his private nature. Julia Pistor, co-producer of The SpongeBob SquarePants Movie, noted that Hillenburg was "very shy". She said: "He doesn't want people to know about his life or family. He's just a really funny, down-to-earth guy with a dry sense of humor who puts his family first and keeps us on our toes in keeping our corporate integrity." Hillenburg said about himself: "I make animation because I like to draw and create things.