Gyula Klima is Professor of Philosophy at Fordham University, New York, Doctor of the Hungarian Academy of Sciences,  Founding Director of the Society for Medieval Logic and Metaphysics and Editor of its Proceedings, as well as an editor of the Stanford Encyclopedia pf Philosophy and of a book series at Fordham, Medieval Philosophy, Texts and Studies. Before taking up his position at Fordham, he had taught philosophy in the US at Yale and Notre Dame, prior to which he had done research in Europe at the universities of Budapest, Helsinki, St. Andrews, and Copenhagen. His publications, besides more than a hundred scholarly papers, include Questions on the Soul by John Buridan and Others: A Companion to John Buridan’s Philosophy of Mind (Springer, 2017), Intentionality, Cognition and Mental Representation in Medieval Philosophy (Fordham University Press, 2015), John Buridan (Oxford University Press, 2008), John Buridan: Summulae de Dialectica, an annotated translation with a philosophical introduction; (Yale University Press, 2001); ARS ARTIUM: Essays in Philosophical Semantics, Medieval and Modern (Institute of Philosophy of the Hungarian Academy of Sciences, 1988). Peter G. Sobol has taught the history of science at the University of Wisconsin – Madison, Oklahoma University, and Indiana University – Bloomington. He is now an emeritus employee of the University of Wisconsin – Madison. he is working on a history of comparative psychology before Darwin. Peter Hartman is an Associate Professor of Philosophy at Loyola University Chicago.  A graduate of the University of Toronto, his research focuses on 14th-century metaphysics and philosophy of mind, with a special focus on Durand of Saint-Pourçain.  He is especially interested in mental acts: what are mental acts? in virtue of what are mental acts about whatever it is they are about? what is thecause of a mental act?  He has published in Vivarium, Journal of the History of Philosophy, Oxford Studies in Medieval Philosophy, and History of Philosophy Quarterly.  As well, he is currently working on an English translation of John Buridan's commentary on Aristotle's Nicomachean Ethics. Jack Zupko is Professor of Philosophy at the University of Alberta.  Prior to joining the Alberta Philosophy Department as Chair in 2013, he was Professor and Chair of Philosophy at the University of Winnipeg and taught philosophy for many years at Emory University and San Diego State University.  He held an NEH Fellowship at the Franciscan Institute, St. Bonaventure University.  He has published numerous research articles and four books, including John Buridan: Portrait of a Fourteenth-Century Arts Master (Notre Dame), which was named a Choice Outstanding Academic Book of 2003, and Duns Scotus on Time and Existence (with Edward Buckner) (CUA Press 2014), a translation and commentary on Scotus’ Questions on Aristotle’s De interpretatione. He has served as a medieval subject editor for the Stanford Encyclopedia of Philosophy since 1998, as well as Book Review Editor (2005-13) and Editor (2015-20) of the Journal of the History of Philosophy.