On the occasion of receiving the 2004 Peter Weiss award in Bochum, Hans Haacke described Peter Weiss’ literary work as being an “unshakeable, moral-rage-driven meddling”. This same right to define himself politically and to meddle corresponds to Hans Haacke’s own artistic stance since the beginning of the 1960s. The combative artist, born 1936 in Cologne and, since 1965, a resident of New York, repeatedly sticks his nose into public debates and takes up a position via his art: documentation and installation. When, in 1971, he criticized the pompous and contemptuous patronage of the Guggenheim sponsors, his exhibition there was unceremoniously canceled. At the 1993 Venice Biennale, he problematized the recent German past by opening a crack in the floor of the German Pavilion. The 2000 installation Der Bevölkerung (the populace) at the Reichstag in Berlin reminds us that there are increasing numbers of people of other origins living in Germany. Haacke has always succeeded in living up to his own self-image as a political enlightener. This publication appeared on the occasion of the 2006 retrospective of his works in Hamburg’s Deichtorhallen and in Berlin’s Akademie der Künste and, from his early works up to today, gives a survey of his wide-ranging conceptual work and a selection of his writings.