Nancy F. Koehn is a historian at the Harvard Business School, where she holds the James E. Robison chair of Business Administration. Koehn's research focuses on effective leadership and how leaders, past and present, craft lives of purpose, worth, and impact. Her book, Forged in Crisis: The Power of Courageous Leadership in Turbulent Times, spotlights how five of history’s greatest leaders managed crises and what we can each learn from their experience.