GEORGE R. MILNER is MILNER is Professor of Anthropology at The Pennsylvania State University. He specializes in archaeology and human osteology, focusing on the prehistoric peoples of the American Midwest and Southeast. His recent book, The Moundbuilders (2004), is an overview of the prehistoric societies of eastern North America. An earlier book,The Cahokia Chiefdom (1998; reprinted 2006), covers the development and organizational structure of the Mississippian period society centered on the largest prehistoric mound center in the United States.