At the time of his death in 2013, he was Anthem Foundation Distinguished Fellow for Research and Teaching in Philosophy at Rutgers University. He was also emeritus professor of philosophy at The College of New Jersey and a Life Member of Clare Hall, Cambridge University. Between 2003 and 2012, he was a visiting professor of the history and philosophy of science at the University of Pittsburgh, where he held an Anthem Fellowship for the Study of Objectivism. More information is available from The Anthem Foundation.

Books and articles:  On Ayn Rand (Wadsworth Publishing Co., 2000); Philosophical Issues in Aristotle’s Biology (co-edited, Cambridge Univ. Press 1987); Aristotle on Nature and Living Things (edited, Bristol Classical Press 1985); “Darwin on Aristotle”, Journal of the History of Biology, 1999 and many articles on ancient philosophy and science.