Rainer Metzger studied art history, history, and German literature in Munich and Augsburg. In 1994, he earned his Ph.D. on the subject of Dan Graham, and subsequently worked as a fine arts journalist for the Viennese newspaper Der Standard. He has written numerous books on art, including volumes on van Gogh and Chagall. Since 2004, he has worked as Professor of art history at the Academy of Fine Arts in Karlsruhe. Ingo F. Walther (1940-2007) was born in Berlin and studied medieval studies, literature, and art history in Frankfurt am Main and Munich. He published numerous books on the art of the Middle Ages and of the 19th and 20th centuries. Walther's many titles for TASCHEN include Vincent van Gogh, Pablo Picasso, Art of the 20th Century, and Codices illustres.