Allan Gotthelf (1942-2013) was Anthem Foundation Distinguished Fellow at Rutgers University, USA, emeritus Professor of Philosophy at The College of New Jersey, Secretary of the Ayn Rand Society (a professional group affiliated with the American Philosophical Association), and the primary editor of its Philosophical Studies series. Between 2003 and 2012, he was visiting professor of History and Philosophy of Science at the University of Pittsburgh. His influential papers on Aristotle are collected in Teleology, First Principles, and Scientific Method in Aristotle’s Biology (2012).