Paul Harrison Tibbitt is a former crew member. He was a writer for many of the show's earliest and most influential episodes, including " SpongeBob SquarePants Chocolate with Nuts," " Frankendoodle," " Idiot Box," " Krab Borg," and " Rock Bottom." He also played other roles on the show, such as composing the song " Electric Zoo" and voicing DoodleBob.
Stephen Hillenburg appointed Tibbitt to take over the position of showrunner after the first movie, when Hillenburg resigned as showrunner. Tibbitt also took over as the voice of Hillenburg's character Potty the Parrot.
Hillenburg: "I selected Paul [Tibbitt] to produce. I totally trusted him. I always enjoyed the way he captured the SpongeBob character's sense of humor." 
second movie, he was credited as executive producer for the remainder of season 9. He was replaced as showrunner by both Vincent Waller and Marc Ceccarelli in 2015, starting with " Lost in Bikini Bottom."
It was said in August
2015 that Tibbitt was working on , The SpongeBob Movie: Sponge on the Run but since then his role as the director and writer was taken over by former  SpongeBob writer and developer Tim Hill, and he left to work for The Mighty Ones at DreamWorks Animation Television. 
Original airing error.
In the original airing of " Ripped Pants," his name is misspelled as "Paul Tibibitt" with an extra I in his surname when credited as storyboard director in the opening credits. However, his name is spelled correctly when later credited as a writer. This error also happens with Mark O'Hare whose name is misspelled as "Mark O'hare" with a lowercase 'h'. These errors were corrected on Amazon releases, later reruns, and DVD releases.
Paul Tibbitt's name spelled incorrectly.
Paul Tibbitt's name spelled correctly on the Halloween DVD.
Artwork by Tibbitt
One of the sketch cards for Topps SpongeBob set