Geoffrey A. Moore is the author of four bestselling, highly infl uential business books: "Crossing the Chasm, Inside the Tornado, The Gorilla Game," and "Living on the Fault Line," He has made the understanding and effective exploitation of disruptive technologies the core of his lifeas work. He is a managing director with TCG Advisors, a consulting firm specializing in strategy and business transformation services, and a venture partner with Mohr Davidow Ventures.