George S. Day is the Geoffrey T. Boisi Professor, Professor of Marketing and co-Director of the Mack centre for Technological Innovation at the Wharton School of the University of Pennsylvania. He previously taught at Stanford University, IMD (International Management Development Institute) in Lausanne, Switzerland, and the University of Toronto, and has held visiting appointments at MIT, the Harvard Business School and the London Business School. Prior to joining the Wharton School, he was Executive Director of the Marketing Science Institute, an industry-supported research consortium.