Over the years of conducting my research, I’ve been a leadership skeptic, influenced by the evidence that complex organizations achieve greatness through the efforts of more than one exceptional individual. The best leaders we’ve studied had a peculiar genius for seeing themselves as not all that important, recognizing the need to build an executive team and to craft a culture based on core values that do not depend upon a single heroic leader. But in cases of decline, we find a more pronounced role for the powerful individual, and not for the better. So, even though I remain a leadership skeptic, the evidence leads me to this sobering conclusion: while no leader can single-handedly build an enduring great company, the wrong leader vested with power can almost single-handedly bring a company down.
–Jim Collins, How the Mighty Fall, p.61-62