Daniel W. GrahamDaniel W. Graham is A. O. Smoot Professor of Philosophy at Brigham Young University. He is the author of Aristotle's Two Systems (1987); editor of the collected papers on ancient philosophy of Gregory Vlastos, Studies in Greek Philosophy (2 vols., 195); translator-commentator of Aristotle: Physics, Book VIII (1999); co-editor with Victor Caston of a Festschrift for his mentor: Presocratic Philosophy: Essays in Honour of Alexander Mourelatos (2002); author of Explaining the Cosmos: the Ionian Tradition of Scientific Philosophy (2006); and co-editor with Patricia Curd of The Oxford Handbook of Presocratic Philosophy (2008). Read More Read Less