Stephen Kotkin is the Birkelund Professor in History and International Affairs at Princeton University, where he has taught since 1989. He is also a fellow at the Hoover Institution at Stanford University. He is the author of Stalin, vol. I: Paradoxes of Power, among other books. For several years he was the book reviewer for the New York Times Sunday Business section (2006-2009), and today writes reviews for the Wall Street Journal and TLS. Kotkin earned a PhD from University of California Berkeley (1988).