SpongeBob writer breakdown up to season 15
As a big one, here's a breakdown on the writers on each SpongeBob season. Only including those with 4 or more writing credits.
Season 1: Tim Hill, Peter Burns (also story editor for the first 13 episodes), Mr. Lawrence, Paul Tibbitt, Ennio Torresan, Jr., Erik Wiese, Sherm Cohen, Aaron Springer, Mark O’Hare, Steve Fonti, Chris Mitchell, Jay Lender, Chuck Klein, Merriwether Williams (took over as story editor starting in episode 14), Vincent Waller, and David Fain
Season 2: Tim Hill leaves for directing various movies like Max Keeble's Big Move, Peter Burns leaves to move back to Chicago, Ennio Torresan Jr demoted to storyboard artist before leaving after this season for Teacher's Pet, Erik Wiese demoted to storyboard artist, Sherm Cohen demoted to storyboard supervisor until leaving during season 4 for My Gym Partner's a Monkey, Steve Fonti leaves for Osmosis Jones (returned only on the storyboard side briefly in season 12), Chris Mitchell leaves for The Powerpuff Girls, Chuck Klein leaves for Teacher's Pet, Vincent Waller leaves for Harvey Birdman Attorney at Law, Walt Dohrn joins, and CH Greenblatt and William Reiss promoted to writers
Season 3: Mr. Lawrence stops writing (but remains in voice acting for the show), William Reiss demoted back to storyboard artist (left during season 4 for Billy & Mandy), David Fain leaves for the Looney Tunes webtoons, and Sam Henderson, Kent Osborne, and Kaz join
Season 4 (aka when Hillenburg left and Tibbitt took over as showrunner): Merriwether Williams, Mark O'Hare, Sam Henderson, and Kaz leave for Camp Lazlo, Jay Lender leaves to write for various video games before working on Phineas & Ferb, Walt Dohrn leaves for DreamWorks Animation, Tim Hill (also getting promoted to co-story editor this season), Vincent Waller, and Chris Mitchell return, Erik Wiese is promoted back to writer, Zeus Cervas promoted to writer, Steven Banks (who was co-story editor with Hill this season), Mike Bell, Luke Brookshier, Tom King, Casey Alexander, Dani Michaeli, Richard Pursel, Eric Shaw, Nate Cash, and Tuck Tucker join, and by the end of the season, CH Greenblatt and Aaron Springer leave for Billy & Mandy and Kent Osborne leaves for Camp Lazlo
Season 5: Tim Hill leaves after Friend or Foe for continuing to direct movies like Garfield A Tale of Two Kitties and Alvin and the Chipmunks, Vincent Waller stops writing but continues directing episodes, Mike Bell leaves for Class of 3000, Kyle McCulloch leaves for South Park, Erik Wiese leaves for The Mighty B, Aaron Springer returns halfway through the season, and Chris Mitchell leaves after Night Light for being a story artist at Sony Pictures Animation. Steven Banks also become sole story editor this season.
Season 6: Mr. Lawrence returns to writing again, Tuck Tucker switches to storyboard director rather than a writer, and Derek Iversen and Sean Charmatz join
Season 7: Tom King leaves for Fanboy & Chum Chum and Eric Shaw leaves for My Friends Tigger & Pooh
Season 8: Vincent Waller returns to writing once more and Marc Ceccarelli and Andrew Goodman join
Season 9A: Paul Tibbitt stops writing and leaves the show after season 9B, Blake Lemons joins, Aaron Springer leaves for Gravity Falls, Vincent Waller no longer writers and stays on the directing side, Steven Banks leaves for Thomas Edison Secret Lab, Dani Michaeli leaves for The Aquabats Super Show, Richard Pursel leaves for Ben 10 Omniverse, Nate Cash leaves for Adventure Time, and Sean Charmatz leaves to be a story artist at DreamWorks Animation
Season 9B: Casey Alexander and Luke Brookshier leave for Uncle Grandpa, Zeus Carvas leaves for Harvey Beaks, Marc Ceccarelli stops writing, Blake Lemons leaves for Sanjay & Craig, Jack Pendarvis, Josh Androsky & Daniel Dominguez, Clare O'Kane, and Solomon Georgio join, and Kaz and Kyle McCulloch (also now story editor) rejoin. Vincent Waller and Marc Ceccarelli take over as showrunners
Season 10: Ben Gruber joins, Richard Pursel briefly returns before leaving again for Mighty Magiswords, Dani Michaeli returns briefly before leaving for good for Little Big Awesome, Kyle McCulloch leaves for Lady Dynamite, Solomon Georgio leaves for Adam Ruins Everything, Jack Pendarvis leaves to go back to Adventure Time, Claire O'Kane leaves for Party Legnds, Josh Androsky & Daniel Dominguez leave for DInglesworth, and Mr. Lawrence becomes the new story editor from this point onward.
Season 11: Luke Brookshier and Zeus Cervas return
Season 12: Zeus Cervas leaves again for Victor and Valentino
Season 13: Danny Giovanni joins, Richard Pursel returns one more time before leaving,
Season 14/15 (produced as one season): Mike Bell returns
Current set of writers now: Mr. Lawrence, Kaz, Andrew Goodman,, Luke Brookshier, Ben Gruber, Mike Bell, and Danny Giovanni