Andrzej Rapaczynski is the Daniel G. Ross Professor of Law at Columbia University. He is known by economists for his research in the 1990s with Roman Frydman on the "transition" in Eastern Europe. Their survey of a wide sample of firms in Eastern Europe yielded important evidence on the impact of ownership on firm performance. Rapaczynski's other work is at the interstices of law, economics, and political science. He is also the author of Nature and Politics, a book on the political theories of Hobbes, Locke, and Rousseau.