When we look for attributes of strong leaders, we look for creativity and curiosity, integrity and empathy, diligence and discipline. Ideally, a great leader embodies all of these attributes, which collectively describe their character, and these leaders invariably point to influences including parents, teachers, mentors, and to critical episodes, including failures. This suggests that we can study and then reverse-engineer the development of great leaders. Leading-edge psychologist Angela Duckworth, whose best seller Grit explores how passion and perseverance lead to high achievement, and Jackie Bezos, fierce advocate for childhood development and youth leadership, discuss what we know about paragons of character, and how we may be able to put that knowledge to use.