Norbert Wolf gratuated in art history, linguistics and medieval studies at the universities of Regensburg and Munich, and earned his PhD in 1983. He held visiting professorships in Marburg, Frankfurt, Leipzig, Dusseldorf, Nuremberg-Erlangen, and Innsbruck. His extensive writings on art history include many TASCHEN titles, such as Diego Velazquez, Ernst Ludwig Kirchner, Caspar David Friedrich, Expressionism, Romanesque, Landscape Painting. About the author: Heather Birchall is Curator of Historic Fine Art at the Whitworth Art Gallery, University of Manchester. She previously worked at the Victoria and Albert Museum, and Tate Britain, helping to organize major exhibitions including Millais (2007) and How We Are: Photographing Britain (2008). A specialist in Victorian art, she has contributed to books and written articles about John Ruskin, the relationship between painting and photography, and British watercolours.