In his sixty-five-year consulting career, Peter F. Drucker, widely regarded as the father of modern management, identified eight practices that can make any executive effective. Leadership is not about charisma or extroversion. It’s about these practices: Effective executives ask, “What needs to be done?” They also ask, “What is right for the enterprise?” They develop action plans. They take responsibility for decisions. They take responsibility for communicating. They focus on opportunities...