James Wilberding is Professor of Philosophy at the Humboldt-Universität zu Berlin, Germany. He has published widely on ancient philosophy, including two volumes in the Ancient Commentators on Aristotle series: Philoponus Against Proclus on the Eternity of the World 12-18 (Bloomsbury Academic, 2006) and Porphyry to Gaurus on How Embryos are Ensouled and On What is in Our Power (Bloomsbury Academic, 2011).