Home › Authors › Douglas J. Den Uyl Douglas J. Den Uyl b. 1950 ยท 6 books Biography Douglas J. Den Uyl is vice president of educational programs at Liberty Fund. Books by Douglas J. Den Uyl God, man, and well being God, man, and well being 2008 Norms of Liberty 2005 Liberalism defended 1997 The virtue of prudence The virtue of prudence 1991 The Philosophic thought of Ayn Rand 1984 Power, state, and freedom Power, state, and freedom 1983