John and his good friend David Schutten once drove from Chicago to Los Angeles in a Jaguar XKE. They got stuck in the desert and inspired James L Brooks to pen the scene in National Lampoons Vacation.
John produced and co - produced 70 episodes of The Simpsons, as well as wrote many of the show's episodes.
John is a staunch libertarian.
John is said to have a love for "anything old timey American" and incorporates this theme into some of his episodes.
John's only ever televised appearance was in a 1985 episode of Saturday Night Live where he played a sailor.
When smoking was banned in the writer's room of The Simpsons, John stopped attending writing sessions and instead submitted his future scripts by driving up to the studio and handing them in through his car window. This was due to John's avid smoking habit.
John is a big fan of Steve Allen and was allegedly "jumping out of his skin" when Allen agreed to do a guest voice on The Simpsons.
When the coffee shop that John wrote in went out of business, he bought the booth he wrote in there and had it installed in his home.
According to Conan O'Brien, Swartzwelder seems like he was taken right out of the 1840s.
Swartzwelder's favorite food is steak.
John is an anti-environmentalist despite being a writer of many of the environmentally centered episodes. Fellow Simpsons writer David X. Cohen recalls John going on a rant about how there is more rain forest on earth now than there was a century ago.
At one point, The Simpsons fans believed the name "John Swartzwelder" was just a pseudonym for writers of episodes, who did not take credit or for episodes written by large amounts of writers.
Swartzwelder is constantly praised on The Simpsons DVD audio commentaries by his fellow writers who call him things like "a very funny man".
John believes the pig is a magical animal, because it has lots of different meat come off it, bacon, pork and ham, etc.
John lives in a mansion, which is on a hill.
John never attended a The Simpsons DVD audio commentary, until season 9, when Mike Scully rang him and got his voice recorded on DVD and got his thoughts on his episode, "The Cartridge Family."
Whenever Swartzwelder appeared in a The Simpsons episode, his caricature would look like the musician, David Crosby, prompting fans to ask why David Crosby was in a scene.
John is a guns rights advocate.
John is a chainsmoker.
John is a big baseball fan and every year, John hires a baseball stadium and plays baseball all day long, with 17 friends.
John wrote for George Meyer's "Army Man" magazine.
John has written novels, "The Time Machine Did It," "Double Wonderful," "How I Conquered Your Planet" and "The Exploding Detective."
John had a long career in advertising, which he maintained until 1985.
John wrote a never aired pilot in 1996, called "Pistol Pete," which was a western.
John is an eccentric recluse.
John was one of the writers who wrote the "Monorail song" in The Simpsons episode "Marge vs. the Monorail".
In "Thank God it's Doomsday", John appears as a guest on a blimp that crashes during a Krusty the Klown Special.
In The Simpsons episode "Bart After Dark", John is shown in the burlesque house.
John is a huge fan of Preston Surges.
In the episode "The Front" Bart and Lisa read a book called "How To Get Rich By Writing Cartoons" by John Swartzwelder.
Springfield is home to the Mt. Swartzwelder historic cider mill.
John thinks that using a "thesaurus" is cheating.
Springfield is next to "Swartzwelder County".
In "Bart the Fink" John Swartzwelder is one of the attendees in Krusty's fake funeral.
In the Simpsons episode, "The Day the Violence Died," John Swartzwelder was one of the surprise witnesses called by Lionel Hutz.
John was one of the 11 writers of The Simpsons Movie.
John has written 59 episodes of The Simpsons which is almost a sixth of all episodes of the show. This is far more than any other writer on the The Simpsons.
John Swartzwelder: (before hanging up the phone during his only recording in a Simpsons DVD commentary) Too bad this is not really John Swartzwelder.
John Swartzwelder: (when asked what he is doing on the phone during the recording of a Simpsons DVD commentary) I was cooking a steak.