Kazimieras Gediminus "Kaz" Prapuolenis (born July 31, 1959; age 61) is an American cartoonist and illustrator, and one of the most renowned living "underground" cartoonists of all time. He is a SpongeBob SquarePants crew member, who had worked on season 3 and seasons 9-12 of the cartoon. He has also worked on several other animated television shows, such as Camp Lazlo and Phineas and Ferb. He returned to SpongeBob as an animation writer in the second half of the ninth season.
However, this only happens in the opening credits on USA airings and digital releases. On the DVD releases and international non-USA airings, it just lists him as "Kaz."
Shortly before production on the fourth season began in 2004, Kaz was invited by his colleague and the series' newly appointed showrunner, Paul Tibbitt, to work on an episode for the fourth season but he was never contacted by Tibbitt again and joined Camp Lazlo after leaving SpongeBob.