Robert Pasnau is College Professor of Distinction in the Department of Philosophy at the University of Colorado Boulder. He has worked in many areas of philosophy, but focuses particularly on the history of philosophy, especially the end of the Middle Ages and the beginnings of the modern era. He is the editor of the Cambridge History of Medieval Philosophy and the founding editor of Oxford Studies in Medieval Philosophy. He is currently in the final stages of a book on the history of the freewill problem. The book argues that this problem, in its modern form, took shape only at the end of the Middle Ages, when a movement known as voluntarism articulated the idea of the will as a faculty that has the undetermined power to make autonomous choices.