Scott Galloway is a professor at New York University’s Stern School of Business, where he teaches brand strategy and digital marketing to second-year MBA students. A serial entrepreneur, he has founded nine firms, including L2, Red Envelope, and Prophet. In 2012, he was named one of the “World’s 50 Best Business School Professors” by Poets & Quants. His weekly YouTube series, “Winners and Losers,” has generated tens of millions of views. The Four: The Hidden DNA of Amazon, Apple, Facebook, and Google is his first book.