Paul J.J.M. Bakker, Ph.D. (1999), Radboud University Nijmegen, is professor of medieval and Renaissance philosophy at Radboud University Nijmegen and Leiden University. His research focuses on philosophical psychology mainly in the tradition of Latin commentaries on Aristotle's De anima.Sander W. de Boer, Ph.D. (2011), Radboud University Nijmegen, is postdoctoral researcher at the University of Groningen (Faculty of Philosophy). He works mainly on the history of philosophical psychology.Cees Leijenhorst, Ph.D. (1998), Utrecht University, is associate professor of modern philosophy at Radboud University Nijmegen. He has published on Thomas Hobbes' natural philosophy, early modern philosophy of mind and Renaissance hermeticism.