In the early 1990s, Oehlen was, for a short time, a member of the third reincarnation of The Red Krayola, and in the mid-1990s a part of Jailhouse (together with Rüdiger Carl and his brother Markus Oehlen), before he and his brother Markus started the project Van Oehlen. Their CDs, We Are Eggsperienced (1998) and Rock and Roll Is Here to Die (2003), brushed jazz and rock references against the grain of electronic possibility. With tireless and ornery cooperation, Oehlen initiated further collective projects, such as Titankatzen, Euphrat, and Tigris right up to Luke & Wendy, which was released in 2017 as a homage to the artist, musician, and filmmaker Tony Conrad, who had just died.
Between 1987 and 2004, Oehlen ran the label Leiterwagen Records, which released two dozen records by artist and musician friends, including Jörg Schlick, his brother Markus (as Don Hobby), and the group Jailhouse. Since 1999, Oehlen has pursued a long-term music project under the pseudonym Wendy Gondeln, devoted to an angular, distorted, minimal electronic approach.