Jonah Berger is a marketing professor at the Wharton School of the University of Pennsylvania and the internationally bestselling author of Contagious, Invisible Influence, and The Catalyst. He's a world-renowned expert on natural language processing, change, social influence, word of mouth, and why products, services, and ideas catch on. Berger has published more than seventy papers in top-tier academic journals; and popular accounts of his work often appear in publications like the New York Times, the Wall Street Journal, and Harvard Business Review. He frequently consults for companies like Google, Apple, Nike, and the Gates Foundation, helping them leverage language, drive change, and get their stuff to catch on. He's been named one of Fast Company's most creative people in business and millions of copies of his books are in print in dozens of languages around the world.