Douglas J. Den Uyl is Vice President of Educational Programs at Liberty Fund, Inc. He has published books and articles in the areas of political philosophy, ethics, and the history of philosophy, including Power, State, and Freedom: An Interpretation of Spinoza’s Political Philosophy (Van Gorcum, 1983), The Virtue of Prudence (Peter Lang, 1991), and (with Douglas B. Rasmussen) Liberty and Nature: An Aristotelian Defense of Liberal Order (Open Court, 1991); Liberalism Defended: The Challenge of Post-Modernity (Edward Elgar, 1997); and Norms of Liberty: A Perfectionist Basis for Non-Perfectionist Politics (Penn State University Press, 2005).