Timothy A. Kohler is a Regents Professor in the Department of Anthropology at Washington State University and an external professor at the Santa Fe Institute. His work has appeared in such publications as American Antiquity, Current Anthropology, and American Scientist. Mark D. Varien is Vice President of Programs at the Crow Canyon Archaeological Center in Cortez, Colorado. His the author of Sedentism and Mobility in a Social Landscape: Mesa Verde and Beyond. Aaron M. Wright is a PhD student in anthropology at Washington State University and a preservation fellow at the Center for Desert Archaeology. His work has appeared in such publications as American Scientist, Archaeology Southwest, and The Artifact.