Jonah Berger is a marketing professor at the Wharton School at the University of Pennsylvania with expertise in social influence, consumer behavior, and product and behavioral trends. His work has been published by the New York Times, Wall Street Journal, and Harvard Business Review. Professor Berger is the internationally bestselling author of multiple books including Contagious: Why Things Catch On (over half a million copies in print in over 30 languages; Simon & Schuster, 2016) and Invisible Influence: The Hidden Forces that Shape Behavior (Simon & Schuster, 2017).