Kelly is best known as the co-creator of the Adult Swim live-action series Your Pretty Face Is Going to Hell, the Adult Swim animated series Stroker and Hoop, and the Adult Swim Infomercials episode Too Many Cooks, which he also directed. Too Many Cooks was released online and went viral, amassing over two million views within five days of its release. He also co-directed and co-wrote another Infomercials episode in 2018 titled Final Deployment 4: Queen Battle Walkthrough which parodies livestreaming gaming culture. He has written episodes of Squidbillies, Harvey Birdman, Attorney at Law, Aqua Teen Hunger Force, and Nickelodeon's CatDog.
He is also a fiction writer. His book, More Stories About Spaceships and Cancer, a collection of short stories, was published in 2012. His short story, The Sensitive Person's Joke Book, was published in the web literary magazine Necessary Fiction.
- Snetiker, Marc (November 7, 2014). "'Too Many Cooks' creator tries to explain his awesomely bizarre Adult Swim short". Entertainment Weekly. Retrieved October 24, 2015.
- Marnell, Blair (June 26, 2018). "Too Many Cooks Creator Returns With Mindbending Twitch Streamer Parody". Nerdist. Retrieved September 8, 2018.
- Kelly, Casper (September 24, 2011). "Necessary Fiction - The Sensitive Person's Joke Book". Necessary Fiction. Retrieved October 24, 2015.
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