Enron provides a blueprint of how insufficient attention to changes in leadership and culture can undermine what, at least on the surface, appears to be a state-of-the-art management control system. While many companies may claim to have sophisticated management controls, the ultimate effectiveness of such controls is highly dependent on an organization’s culture and leadership. The perversion of this control infrastructure under the leadership of Jeffrey Skilling offers vital lessons about the operation of management control systems in large, complex organizations. Understanding these lessons is crucial in ensuring that Enron’s plight is not replicated.