After studying at Oxford, King's College London, and Cornell, Ralph Wedgwood taught at the Massachusetts Institute of Technology (1995-2002) and at Merton College, Oxford (2002-2011), before taking up his current position at the University of Southern California in 2012. He works principally on ethics and epistemology. His interests in ethics include the history of ethics (especially Plato and Butler) and issues in applied political philosophy (especially relating to same-sex marriage); but most of his work in ethics has focused on metaethics and the theory of rational choice and practical reason. He is the author of The Nature of Normativity (Oxford University Press, 2007), and of about fifty articles in various volumes and philosophy journals.