The systematic analysis of the Stiftung’s own works in the Museum Berggruen is also supported in part by the Deutsches Zentrum für Kulturgutverluste. At issue are the provenances of the 135 paintings, sculptures, and works on paper produced before 1945 and held in this museum, which falls under the Nationalgalerie Collection. In addition, this project explores the enthralling history of Heinz Berggruen’s former private collection, which reads like a history of the international art market of the 20th century.