Robert Boyd has written widely on evolutionary theory, focusing especially on the evolution of cooperation and role of culture in human evolution. His book Culture and the Evolutionary Process received the J. I. Staley Prize. He has also published numerous articles in scientific journals and has edited volumes. He is currently Professor of Anthropology at the University of California, Los Angeles and on the faculty of the Santa Fe Institute.

Joan B. Silk has conducted extensive research on the social lives of monkeys and apes, including extended fieldwork on chimpanzees at Gombe Stream Reserve in Tanzania, and baboons in Kenya and Botswana. She is also interested in the application of evolutionary thinking to human behavior. She has published numerous articles in scientific journals and scholarly edited volumes, and is currently Professor of Anthropology at the University of California, Los Angeles.

The science of human evolution, not just the sites.

How Humans Evolved remains the most up-to-date, forward-looking book in physical anthropology. Through a unique and balanced blend of evolutionary theory, population genetics, and behavioral ecology, the authors move beyond merely describing anthropological "finds" to showing students the big picture about how humans lived in the past and why they have evolved into the people they are today. The fully revised and updated Sixth Edition offers the best of current research, including important new coverage of Ardipithecus, the Neanderthal genome, early complex tool-making and symbolic behavior, and much more.