Moshe Hoffman is a research scientist at the MIT Media Lab Human Dynamics Group and lecturer at Harvard's department of economics. His research focuses on using game theory, models of learning and evolution, and experimental methods to decipher the motives that shape our social behavior, preferences, and ideologies. He lives in Cambridge, Massachusetts. Erez Yoeli is a research associate at MIT's Sloan School of Management, where he directs the Applied Cooperation Team (ACT). His research focuses on altruism: understanding how it works and how to promote it. Yoeli collaborates with governments, nonprofits, and companies to apply the lessons of this research towards addressing real-world challenges like increasing energy conservation, improving antibiotic adherence, reducing smoking in public places, and promoting philanthropy. He lives in Cambridge, Massachusetts.