He has conducted ethnographic fieldwork in Amazonia among the Yanomamo of Venezuela, the Yora of Peru and the Achuar (Shiwiar) of Ecuador and he has also worked in the Andes with the Otavalo and Cotacachi Indians of Highland Ecuador. His research interests include optimal foraging theory, indigenous subsistence strategies, warfare, belief systems, the evolution of complex societies, ethnohistory and the effects of globalization on indigenous peoples. David H. Dye is an Associate Professor of Earth Sciences at the University of Memphis. He has conduced archaeological research throughout the Southeastern. His research interests include the archaeology and ethnohistory of the Midsouth. He has had a long-term interest in late prehistoric warfare, ritual, and iconography in the Eastern Woodlands.