The deep changes necessary to accelerate progress against society’s most intractable problems require a unique type of leader—the system leader, a person who catalyzes collective leadership.   With the passing of Nelson Mandela in late 2013, the world celebrated a remarkable life. But the spotlight on Mandela’s accomplishments relegated to the shadows much of the reason that he has had such a lasting impact, in South Africa and beyond. Above all, Mandela embodied a system leader, someone able to bring forth collective leadership. In countless ways, large and small, he undertook interventions aimed at bringing together the remnants of a divided country to face their common challenges collectively and build a new nation.