Branded a heretic by the London Times for his arguments in favor of legalizing markets in human organs in his book Stakes and Kidneys: Why markets in human organs are morally imperative (Ashgate, 2005), he is also the author of Practical Autonomy and Bioethics (Routledge, 2009), and Death, Posthumous Harm, and Bioethics (Routledge, 2012). He is the editor of Personal Autonomy: New essays (Cambridge University Press, 2005) and Death: Metaphysics and Ethics (Oxford University Press, 2013). He is currently working on a book on the ethics of using compensated donation to procure blood and blood products.