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Professor Dieter Ronte Dieter Ronte works as a free-lance art historian, curator, and lecturer. He was Director of the Museum moderner Kunst Stiftung Ludwig (mumok) in Vienna from 1979 to 1989, before being appointed as Director of the Sprengel Museum in Hanover. From 1994 to 2008, he served as Director of the Kunstmuseum Bonn.