Most of his work has been and is in philosophical ethics. He has written on metaethics (on the nature of ethics, its epistemology, and its metaphysics), normative ethics (especially on utilitarianism and virtue ethics), and applied ethics (especially medical ethics, environmental ethics and business ethics; and he is Chairman of the Management Committee of the Oxford Uehiro Centre for Practical Ethics: http://www.practicalethics.ox.ac.uk). Roger is also interested in the history of ethics (especially ancient ethics and British moral philosophy since Hobbes), and recently edited an Oxford Handbook of the History of Ethics. He has defended a ‘sufficientarian’ view of justice (the idea that justice requires that we give priority to those who don’t have enough). His most recent book is on Henry Sidgwick. His The Methods of Ethics (7th edn., 1907) is thought by a surprisingly large number of people (including Roger – sometimes, anyway) to be the best work in philosophical ethics ever written. He is currently writing a book on self-interest and morality in the British moral philosophical tradition from Hobbes to Bentham. You can read a bit more about his views in an interview in T. Petersen and J. Ryberg (ed.), Normative Ethics: Five Questions (Automatic Press, 2007). He has an academia.edu page, and there are some iTunes podcasts on the University site.