He has written on a wide range of issues in moral and political philosophy. His recent theoretical work concentrates on moral perception and the relationship between ethics and phenomenology, though he continues to do research on torture and its underpinnings. His publications include Wittgenstein and Ethical Inquiry (Continuum, 2007), The Politics of Agency (Ashgate, 2008), The Ethics of Torture (with R. D. Emerick, Continuum Press, 2009), and