What's the difference between CEOs like Lou Gerstner of IBM and Larry Ellison of Oracle? Between basketball coaches Phil Jackson and Bobby Knight? Or media entrepreneurs Oprah Winfrey and Rupert Murdoch? Gerstner, Jackson, and Winfrey are provocateurs, leaders who are successful not just because they have built a company or an organization, but because they have created a community. Provocateurs are changing both the form and the content of leadership...