Donald E. Sexton, Ph.D., is Professor of Business at Columbia University, where for more than forty years he has taught marketing and quantitative methods and earned the Business School’s Distinguished Teaching Award. His numerous articles on marketing return, marketing, and branding strategy have appeared in publications such as the Harvard Business Review, Journal of Marketing Research, and Management Science. He is often quoted in media such as The New York Times, BusinessWeek, and WCBS. Dr. Sexton is the principal of The Arrow Group, Ltd.® which has provided consulting and training to companies such as GE, IBM, Pfizer, Unilever, Citigroup, DuPont, and Verizon. He has taught at the China Europe International Business School, UC-Berkeley, INSEAD, the Indian School of Business, the Australian Graduate School of Management, Skolkovo, and the U.S. Business School in Prague. Sexton holds an M.B.A. and Ph.D. from the University of Chicago in business economics, statistics, and mathematical methods and a B.A. from Wesleyan University in mathematics and economics. His books include Marketing 101, Branding 101, and Marketing and Management Science.