Éric Darragon, born in 1944, is a French art historian who taught at the University Paris 1 Sorbonne until his retirement. He was director of the Research Centre for Cultural and Social History of Art (EA4100) and the Inter-University Research Centre for Contemporary Art (CIRHAC). He was also a member of the editorial board of the magazines Critique d’art and Perspective and has published extensively on German artists and photographers. Benjamin Katz, born 1939 in Antwerp, is a son of Berlin Jews. From 1956 he lived in Berlin where he founded with Michael Werner a gallery. The opening exhibition with Georg Baselitz turned into a scandal when two paintings were confiscated by the public prosecutor office because of indecent content. Since 1972 Katz lives in Cologne. In addition to his extensive series of portraits of artists, which made him world famous, he is a constant chronicler of everyday life and its pitfalls. He archived nearly 500,000 negatives, which now deserves full attention with the exhibition at Marta Herford.