Economist Herbert Gintis studies why people do the things they do using game theory and mathematical models. An emeritus professor at the University of Massachusetts, Gintis has also taught at the Santa Fe Institute and Barnard College. The author of Game Theory Evolving and co-author of the forthcoming title, The Cooperative Species: Human Sociality and its Evolution, Gintis believes that most people are predisposed to cooperate and be altruistic, and they aren