Books:Geeks and Geezers (2002), Organizing Genius (1997), 21st Century Organization (1995), Learning to Lead (1994), On Becoming a Leader (1989)

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Born: 1952
Pedigree: Professor, Harvard Business School
Education: Master's of Philosophy in applied econometrics, Oxford University (Rhodes Scholar); MBA, DBA, Harvard Business School
Speaking Fee: $40,000+
Shtick: Disruptive innovation is the key to sustainable profitable growth.
Bio: Christensen gained a great deal of notoriety for his 1997 book, The Innovator's Dilemma. It advanced the then-bold idea that the Internet and other high-impact technologies would initially falter but eventually dominate - forcing businesses that do not adapt to risk obsolescence. It didn't take long for cash-strapped start-ups and venture capitalists to glom onto the idea. Despite the dot-com crash and a failed mutual fund venture based on disruptive technology, Christensen has remained a thought leader, and his popularity has not waned. He is cited by other gurus and appears regularly in business magazines, including BusinessWeek.
Books:See What's Next (2004), The Innovator's Solution (2003), Innovation and the General Manager (1999), The Innovator's Dilemma (1997)

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Born: 1958
Pedigree: Independent researcher
Education: MBA, Stanford University
Speaking Fee: $45,000+
Shtick: Long-term success grows out of ideology, not technology.