Sabine Frommel is the chair of Renaissance art history at the École Pratique des Hautes Études-PSL (Paris, Sciences et Lettres University), since 2003. Her research addresses the great architects of the Italian Renaissance, evolution of typologies, architectural languages, and migratory processes in Europe.Jean Guillaume was professor emeritus of Renaissance art history at the Sorbonne in Paris. His research focused on Renaissance architecture in France and Italy, particularly in relation to French chateaux. Recently he was working on a monograph on the Louvre and the Tuilleries in the sixteenth century.