Dr Edwin van de Haar specializes in the liberal tradition in (international) political theory. He has lectured political theory and international relations at Brown University, Leiden University and Ateneo de Manila University. This article is based on his new book Degrees of Freedom. Political Philosophy and Ideology (Transaction Publishers, April 2015). Earlier he wrote Classical Liberalism and International Theory. Hume, Smith, Mises and Hayek (2009), as well as a number of chapters and articles on the wider liberal tradition in international political theory.