Sean is an assistant professor of economics at Scripps College in Claremont, California. He is the author of the international best seller "Economics for Dummies" as well as the coauthor, along with Campbell McConnell and Stanley Brue, of the world's best-selling college economics textbook, "Economics: Principles, Problems, and Policies". An avid martial artist, Sean is a former Aikido national champion and has coached five of his students to U.S. national aikido titles. A recurring commentator on FOX Business, ABC News, and NPR, Sean holds a B.A. in economics from the University of Southern California and a Ph.D. in economics from U.C. Berkeley, where he completed his dissertation under the supervision of Nobel Laureate George Akerlof.Sean's research focuses on the often puzzling and seemingly irrational behavior of stock market investors, but he's also investigated topics as wide-ranging as the factors that affect customer tipping behavior at restaurants and why you see a lot of unionized workers only in certain industries.