#60;b#62;Michael E. Smith#60;/b#62; is Professor of Anthropology in the School of Human Evolution and Social Change at Arizona State University . He has directed excavations at numerous Aztec sites and is co-editor (with Marilyn Masson) of #60;i#62;The Ancient Civilizations of Mesoamerica: A Reader#60;/i#62;, (Blackwell, 1999) and author of #60;i#62;Aztec City-State Capitals#60;/i#62; (2008)