STEPHEN WUNKER worked with Christensen for years, led development of one of the first smartphones, and now runs New Markets Advisors. He has written for Forbes, Harvard Business Review, and The Fin...view moreSTEPHEN WUNKER worked with Christensen for years, led development of one of the first smartphones, and now runs New Markets Advisors. He has written for Forbes, Harvard Business Review, and The Financial Times.view less