Norbert Wolf gratuated in art history, linguistics and medieval studies at the universities of Regensburg and Munich. He took his doctorate in art history in 1983. In 1992 he wrote his professorial thesis in Munich on carved 14th-century retables. Subsequently he held visiting professorships in Marburg, Frankfurt a.M., Leipzig, Dusseldorf, Nuremberg-Erlangen, and Innsbruck. He has written extensively on art history, including the many titles for TASCHEN, such as Diego Velazquez, Ernst Ludwig Kirchner, Caspar David Friedrich, Expressionism, Romanesque, Landscape Painting. Annette Hagedorn studied the history of oriental art, German literature, and art history at the universities of Bonn and Mainz. She has held part-time teaching posts at the universities of Bonn, Mainz and Utrecht. Since 2000 she has been co-editor, responsible for art history and archaeology, of the journal "Zeitschrift der Deutschen Morgenlandischen Gesellschaft".