A. P. Martinich is the Roy Allison Vaughan Centennial Professor of Philosophy and Professor of History and Government at the University of Texas at Austin. He is the author or editor of many books, including Hobbes (2005), Philosophical Writing (3rd edn., 2005), and The Philosophy of Language (5th edn., 2007). Fritz Allhoff is Assistant Professor of Philosophy at Western Michigan University. His main areas of research are ethical theory, applied ethics, and the philosophy of biology/science. His work has been published in, among other places, the American Journal of Bioethics, the Cambridge Quarterly of Healthcare Ethics, History and Philosophy of the Life Sciences, the International Journal of Applied Philosophy, and the Kennedy Institute of Ethics Journal. Anand Jayprakash Vaidya is Assistant Professor of Philosophy at San José State University. His research is in metaphysics, epistemology, and philosophy of mind.