Polly Wiessner is a professor of anthropology at the University of Utah. Wiessner worked at the Max Planck Institute’s research group for Human Ethology in Andechs, Germany from 1981-1998 and has been a visiting professor at the University of Aarhus and the Ecole des Hautes Etudes. She has conducted research among the Ju/’hoan Bushmen of the Kalahari since 1973 on the role of social networks in reducing risk and how Bushmen reconfigure social networks to fit changing times. She is currently analyzing stories told about real people and events at night to understand the predominant themes, norms and values in Bushman society. Since 1985, Wiessner has conducted research among the Enga of highland Papua New Guinea, using historical traditions to study the developments in warfare, ritual and exchange that occurred from the time of the introduction of the sweet potato some three hundred years ago until first contact with Europeans. Over the past decade, she has studied the impact of the adoption of high-powered weapons into tribal fighting, a corresponding surge in warfare between 1990-2008, followed by recent movements towards peace. Together with Enga colleagues, she is looking at the norms and values used in indigenous institutions to restore peace. She has established a non-profit, the Tradition and Transition Fund, that works for food security among the Bushmen and for preservation of cultural knowledge and for cultural education among the Enga.