Born 1921 at Krefeld, Germany. Died 1986 at Dusseldorf, Germany.
He participated in the Fluxus in its first years, and was noted for many performances. Later he came to the concept of “social sculpture” which expands the concept of sculpture and art into education and social innovation, and was involved in political activity aiming to build a normal relationship between society and art. He is one of the founders of the Green Party.