George S. Day is the Geoffrey T. Boisi Professor and co-director of the Mack Center for Technological Innovation at The Wharton School, University of Pennsylvania. Chairman of the board for the American Marketing Association, he has served as a consultant to GE, IBM, Medtronic, Merck, W.L. Gore & Associates, and other corporations. His books include Strategy from the Outside In and Peripheral Vision, among others. Day lives in Bryn Mawr, Pennsylvania.