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 postdoctoral 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. Georg Satzinger, Professor of Art History at the University of Bonn since 1997, wrote his doctoral thesis on the pilgrimage church of Madonna di San Biagio near Montepulciano, an important central-plan building of the High Renaissance. He qualified as a university lecturer with a thesis on Michelangelo’s projects for the façade of San Lorenzo in Florence. He has authored numerous publications on 15th- and 16th-century Italian architecture and sculpture, on the history of Michelangelo’s influence, as well as on Albrecht Dürer and Balthasar Neumann, among others. Michael Rohlmann gained his doctorate with a thesis on the import of Early Netherlandish painting into Early Renaissance Florence. He qualified as a university lecturer with a thesis on the pictorial decoration of the Sistine Chapel. He is the author of numerous publications on Italian and French painting of the early modern period. He teaches art history at the University of Cologne and the University of Wuppertal. Rudolf Hiller von Gaertringen has been studying the work of Raphael since his master’s degree. He compiled the scholarly catalogue of the holdings of early Tuscan and Umbrian paintings at the Städel Museum in Frankfurt and has also published numerous essays on Italian and German art. Since 2002 he has been head of the art collection of the University of Leipzig and since 2012 Associate Professor of Art History.