Jonah Berger is the James G. Campbell Jr. Assistant Professor of Marketing at the Wharton School at the University of Pennsylvania. He studies social influence and social epidemics, or how products, ideas, and behaviours catch on and become popular. This book is based on a popular, award-winning course Berger teaches at Wharton to undergraduates, MBAs and Executives. His research has been published in top-tier academic journals in psychology, economics, marketing and management, and popular accounts of his work have appeared in the New York Times, Wall Street Journal, NPR, Science, Harvard Business Review, Sloan Management Review, Wired, Business Week, The Atlantic, and The Economist. His research has been featured in the New York Times Magazine's Year in Ideas. Berger has been recognized with a number of awards for both scholarship and teaching, including the Iron Professor Teaching Award and the MBA Curricular Innovation Award from the Wharton School and best paper honourable mention from the Journal of Consumer Research. The Marketing Science Institute named him one of the top young scholars in the field.