Benjamin Katz, born in Antwerp in 1939 as the son of German Jews, rose to fame with his compelling portraits of artists such as Georg Baselitz, J?rg -Immendorff, Josef Beuys, James Lee Byars, Sigmar Polke, and Gerhard Richter. Hardly any exhibition of the so-called German princely painters - Benjamin Katz has been associated with some of them for years - manages without his subtle portraits. But his archive of over half a million negatives from more...