 As a student, he began to build his own art collection, acquiring his first painting by Cy Twombly in 1966.By the age of 23 he had bought works by Twombly, Beuys, Fontana, Yves Klein, de Kooning, Cornell, and Kounellis.In 1970, together with Rolf Möllenhof (born 1939, Chemnitz), he directed the Möllenhof/Greve Galerie.