Tyler Cowen is Holbert L. Harris Professor of Economics at George Mason University and also Director of the Mercatus Center. He received his Ph.d. in economics from Harvard University in 1987. His book *The Great Stagnation: How America Ate the Low-Hanging Fruit of Modern History, Got Sick, and Will (Eventually) Feel Better* was a New York Times best-seller. He was recently named in an *Economist* poll as one of the most influential economists of the last decade and last year Bloomberg BusinessWeek dubbed him "America's Hottest Economist." *Foreign Policy* magazine named him as one of its "Top 100 Global Thinkers" of 2011. He co-writes a blog with Alex at www.marginalrevolution.com and with Alex he is the co-author of *Modern Principles: Microeconomics* and *Modern Principles: Macroeconomics*, two introductory texts.