GREGORY L. POSSEHL is a professor of Anthropology at the University of Pennsylvania and Curator of the Asian Collections at the University of Pennsylvania Museum of Archaeology and Anthropology. He has been engaged in archaeological research in Indian and Pakistan since 1964, from Iron Age megaliths to Mesolithic encampments, including directing excavations at Rojdi in Gujarat and Gilund in southern Rajasthan. Possehl has written and edited a number of important books on the Indus Civilization and related topics.