received the PhD degree in mathematics from the University of Bonn and the Habilitation from Technische Universität Berlin with work on "Polyhedral Surfaces of Constant Curvature." He is the scientist in charge of the key area "Visualization" at the DFG Research Center "Mathematics for key technologies" and head of the research group "Geometry and Visualization" at Zuse Institute Berlin (ZIB) (since 2004). His current interests are discrete and differential geometry, applied geometry, and mathematical visualization. He is on the editorial board of five mathematics journals, book, and video series. He has published several books, coauthored the award-winning mathematical software packages JavaView ( www.javaview.de
) and Grape (European Academic Software Award in Mathematics), and produced computer generated mathematical videos. His videos were shown at the SIGGRAPH Electronic Theatre and many other juried venues, including VideoMath at ICM '98, Sibgrapi, and NICOGRAPH.