Tom Hafen is currently Head of Marketing on National Growth Brands at Nestle Waters USA. Tom's past roles include leading marketing for the Gerber Infant Formula Business at Nestle, managing the Iams pet care brand at Procter and Gamble, and leading US marketing for tablets and phones at Microsoft. He also helped lead the Winnie the Pooh brand at the Walt Disney Corporation. In addition to teaching at Columbia Business School, Tom is a Lecturer in Management at Yale. His publications include research on digital marketing, social media, and U.S. business history. Tom has a joint MBA/Ph.D from the University of Chicago.