CLAYTON M. CHRISTENSEN (1952-2020) was the Kim B. Clark Professor at Harvard Business School, the author of nine books, a five-time recipient of the McKinsey Award for Harvard Business Review's best article, and the cofounder of four companies, including the innovation consulting firm Innosight. In 2011 and 2013 he was named the world's most influential business thinker in a biennial ranking conducted by Thinkers50. TADDY HALL is a principal with the Cambridge Group and a leader of Nielsen's Breakthrough Innovation Project. In these capacities, he helps senior executives create successful new products and improve innovation processes. He also works extensively with executives in emerging markets as an advisor to the nonprofit Endeavor. KAREN DILLON is the former editor of the Harvard Business Review and coauthor of the New York Times bestseller How Will You Measure Your Life? She is a graduate of Cornell University and Northwestern University's Medill School of Journalism. In 2011 she was named by Ashoka as one of the world's most influential and inspiring women. DAVID S. DUNCAN is a senior partner at Innosight. He's a leading thinker and advisor to senior executives on innovation strategy and growth, helping them navigate disruptive change, create sustainable growth, and transform their organizations to thrive for the long term. He is a graduate of Duke University and earned a PhD in physics from Harvard University.