 Andreas Schwarz-Ruszczynski played in other groups throughout the 1990s, collaborating with Boy George, Trevor Horn, Klaus Schulze, Pet Shop Boys, Steve Lipson, Julian Mendelsen and Jack White.In 1999 German techno band UKW, with Schwarz-Ruszczynski aboard, entered the dance charts with "Hypnotic", produced by local trance DJ–producer ATB.Schwarz-Ruszczynski opened his own recording studio, Bibest Studio, in Berlin and has co-produced, written, and recorded projects.