2008–         Leitner Professor of Philosophy and International Affairs and Director of the Global Justice Program, Yale University

2007–19     Professor of Political Philosophy at the Centre for Professional Ethics of the University of Central Lancashire

2007–17     Research Director, Centre for the Study of Mind in Nature, University of Oslo

2013–16     Professor of Philosophy and Global Justice, The Dickson Poon School of Law, King’s College London

2012–13     Professor of Human Rights and Global Justice, School of Social and Political Sciences, The University of Sydney

2004–12     Professorial Fellow, Centre for Applied Philosophy and Public Ethics, ANU

2006–08     Professor of Political Science, Columbia University

2003–04     Visiting Scholar, Department of Clinical Bioethics, National Institutes of Health

5/1991        Tenure at Columbia University

1983–2006 Assistant/Associate Professor of Philosophy, Columbia University

6/1983        Ph.D. in philosophy, Harvard University; dissertation on Kant, Rawls, and global justice (Advisor: John Rawls)

5/1977        Diplom in Soziologie, highest honors, Hamburg University; thesis on Peirce and Habermas (Advisor: Jan Peter Kob)