ジ・オニオン
Mueller is noted for his work with the news satire organization, The Onion, which he began his association with around 1989. In 1999, he began writing material and providing the voice for The Onion Radio News' fictional newsreader, Doyle Redland. Mueller also provided narration for the audiobook version of "The Onion" book, "Our Dumb Century" (). The photograph of Doyle Redland featured in "The Onion" publications is not of Mueller.