Henning Christiansen was a Danish composer and an active member of the Fluxus-movement. His overall goal was to work collaboratively and to trespass conventional boundaries. He resented the idea of an isolated artistic genius and his entire production can be seen as a subsequent and vibrant example of praxis in a constant flux. This is visible from his engagement in Fluxus, over numerous collaborative performances to his position as a professor at the Art Academy in Hamburg (Hochschule für Bildende Künste - HfBK). He worked with artists such as Joseph Beuys and Nam June Paik, as well as with his wife Ursula Reuter Christiansen. Other collaborators include Bjørn Nørgaard, Carlo Quartucci, Carla Tato, Ernst Kretzer, Ben Patterson, David Moss, Ute Wassermann, Andreas Oldörp, Christophe Charles, Bernd Jasper, Henrik Kiel, Vilem Wagner, Vladimir Tarasov, Niko Tenten, and many others.