The editor and author: Frank Zöllner wrote his doctoral thesis on motifs originating from Antiquity in the history of art and architecture of the Medieval and Renaissance periods (1987). He is also the author of a post-doctoral treatise on motion and expression in the art of Leonardo da Vinci, published in 2010. He has published numerous works on Renaissance art and art theory, and on 20th-century art. Since 1996 he has been Professor of Medieval and Modern Art at the University of Leipzig. For TASCHEN he has authored the XL monographs on Leonardo da Vinci and Michelangelo. The contributing authors: Christof Thoenes studied art history in Berlin and Pavia, before completing his doctorate in Berlin. Thoenes lives in Rome, where for many years he has worked for the Bibliotheca Hertziana (Max-Planck-Institute), and is honorary professor in Hamburg. He has contributed to numerous publications on Italian art, particularly on architecture and architectural theory of the 15th to 18th centuries. Thomas Pöpper wrote his doctoral theses on 15th century Italian Renaissance sculpture. He has worked as a curator for contemporary art at the Schleswig-Holsteinisches Landesmuseum. He taught at the Northern Institute of Technology and at the University of Hamburg, lecturing art history at Leipzig University and has been professor at the Westsächsische Hochschule Zwickau since 2008. Pöpper is the author of a range of publications on Italian Medieval, Renaissance, and Baroque art as well as on 19th and 20th century German painting and sculpture.