Gyula Klima is Professor of Philosophy at Fordham University, New York, USA; Doctor of the Hungarian Academy of Sciences; Founding Member and Director of the Society for Medieval Logic and Metaphysics, and Editor of its Proceedings. Professor Klima’s most recent book is John Buridan in OUP’s Great Medieval Thinkers series.Alexander W. Hall is Associate Professor of Philosophy at Clayton State University, Georgia, USA; Assistant Director of the Society for Medieval Logic and Metaphysics, and Managing Editor of its Proceedings. Hall’s recent scholarship includes Natural Theology in the Middle Ages in the Oxford Handbook of Natural Theology (OUP, 2012).