MICHAEL PHILIPP is Chief Curator at the Museum Barberini, Potsdam, Germany. NERINA SANTORIUS is Curator and Head of Impressionism at the Museum Barberini, Potsdam, Germany. ORTRUD WESTHEIDER is Director of the Museum Barberini, Potsdam, Germany. DANIEL ZAMANI is Artistic Director of the Museum Frieder Burda, Baden-Baden, Germany.