Dan Ariely is the author of The Upside of Irrationality and Predictably Irrational. He is the James B. Duke Professor of Psychology and Behavioral Economics at Duke University, with appointments at the Fuqua School of Business, the Center for Cognitive Neuroscience, the Department of Economics, and the School of Medicine. Dan earned one PhD in cognitive psychology and another PhD in business administration. His work has been featured in the New York Times, the Wall Street Journal, the Washington Post, the Boston Globe, Business 2.0, Scientific American, and Science. Dan has appeared on CNN and CNBC, and is a regular commentator on National Public Radio's Marketplace. He lives in Durham, North Carolina, with his wife and two children.