Simon Rippon is a philosopher specializing in ethics. In his doctoral research at Harvard he worked on metaethical and epistemological issues, trying how moral truths could be knowable. He later moved to Oxford to take up a post doctoral post in bioethics where he also pursued research in normative ethics and applied ethics more generally. In practical ethics, he has particular interests in fairness in organ donation systems and the moral limits of markets, moral disagreement and the nature of moral expertise, the concepts of health and disease and their normative significance, and the moral significance of findings in social psychology and neuroscience. In metaethics, he has particular interests in sentimentalist explanations of the nature of reasons and normativity, and in moral epistemology. He is a former Graduate Fellow of the Edmond J. Safra Center for Ethics at Harvard's Kennedy School of Government.