Danhausen made his debut on October 18, 2013, becoming known for sticking to a gimmick illustrated by his spooky attire and painted face. He competed at BLP Slamilton 2, an event produced by Black Label Pro Wrestling, where he teamed up with Ethan Page and Swoggle to defeat Blood Diamond (Jake Lander, Joshua Bishop and Tre Lamar) for the BLP Tag Team Championship. He competed for Capital City Championship Combat at C4 Combat Shock – 12th Anniversary on November 21, 2019, where he defeated Tony Deppen. At FU/Freelance I Don’t Think We’re In Chicago Anymore from October 10, 2020, an event produced by Freelance Underground Wrestling, Danhausen teamed up with Warhorse as Warhausen, defeating The Brothers Of Funstruction (Ruffo The Clown and Yabo The Clown) by disqualification, therefore failing to capture the FU Tag Team Championship. At F1RST Wrestling Saturday Night Nitro, an event produced by F1RST Wrestling on March 7, 2020, Danhausen fought Orange Cassidy into a no-contest.
Danhausen made his first appearance for Ring Of Honor at ROH Wrestling #429 on November 2, 2019, where he unsuccessfully challenged Shane Taylor for the ROH World Television Championship. He continued to make sporadic appearances such as at ROH Wrestling #437 where he fell short to Rhett Titus on January 11, 2020, and at ROH Honor Reigns Supreme 2020 on January 12, where he scored a defeat against Dak Draper. At ROH Free Enterprise on February 9, 2020, Danhausen participated in a 20-man battle royal to determine the no.1 contendership for the ROH World Championship, where he competed against the winner Flip Gordon, Gangrel, PJ Black, Tracy Williams and others. At ROH Final Battle 2020 on December 18, he defeated Brian Johnson by disqualification, earning him an ROH contract (behind the scenes, Danhausen credits Alex Shelley with convincing ROH brass to sign him). At ROH 19th Anniversary Show on March 26, 2021, Danhausen competed in a four-way match, falling short to the winner, Brian Johnson, Eli Isom and LSG.
Danhausen made his All Elite Wrestling (AEW) debut during a special episode of Dynamite called Beach Break on January 26, 2022. He appeared during the Lights Out match between Orange Cassidy and Adam Cole. Hours later, AEW President Tony Khan announced that Danhausen had signed with the company. Danhausen has described his character as “Conan O’Brien possessed by a demon”.
In April 2021, he appeared as a guest on O’Brien’s podcast Conan O’Brien Needs a Friend to discuss this concept. The character wears horror-themed face paint and believes he has supernatural powers, such as shooting lightning from his fingers and the ability to put curses on his enemies. The voice for his character is based on O’Brien and Mark Hamill’s Joker. He often refers to himself in the third person, adds the suffix “-hausen” to words, chastises other wrestlers if they use profanity, and describes himself and things he likes as “very nice, very evil”. He is also known for nonchalantly dancing a “Pee-wee Herman dance” to the song “Tequila” in the middle of matches.