Recently, there has been a profound change in how we think about corporate leadership. The 1990s was the era of celebrity leaders: we focused on Jack Welch, and not GE, on Bill Gates, and not Microsoft, on Steve Jobs, and not Apple, on Larry Ellison and not Oracle. But, on reflection, the records of most high-profile leaders have not withstood closer scrutiny. In almost all cases, it turns out that the success of organizations is due to the collective efforts of many, and not to the genius of a single, all-powerful individual at the top.