MARTIN A. NOWAK is Professor of Biology and Mathematics at Harvard University. He is Director of the Program for Evolutionary Dynamics. In 1998 he moved to Princeton to establish the first center in Theoretical Biology at the Institute for Advanced Study. Nowak has won many prizes and has revolutionized the mathematical approach to biology. Nowak has made important contributions to the understanding of virus infections and cancer. He has pioneered the mathematical theory for the evolution of human language and altruistic behavior.Supercooperators will be Nowak's first book for a general audience.