His areas of specialization are ethics and political philosophy. Within these areas he is currently doing research on global justice, human rights, and the role of the concept of feasibility in moral and political reasoning (including the consequences for the relation between “ideal” and “nonideal theory”). His publications include a recent monograph, From Global Poverty to Global Equality: A Philosophical Exploration, as well as articles in The Journal of Political Philosophy, Political Theory, Social Theory and Practice, and Ethical Theory and Moral Practice.