M. Steven Shackley is Emeritus Professor of Anthropology, University of California, Berkeley and Director of the Geoarchaeological XRF Laboratory, Albuquerque, New Mexico. Shackley is the recipient of the Society for American Archaeology’s Fryxell Medal for Interdisciplinary Research (Physical Science) in 2019 and the Award for Excellence in Archaeological Analysis in 2011. His undergraduate degrees are in Environmental Geology and Anthropology from San Diego State University (1979), a Master’s degree in anthropology from SDSU (1981), and a PhD in Anthropology from Arizona State University (1990). Field and laboratory work in archaeological geochemistry includes all continents, particularly the Caucuses in Russia for Neanderthal obsidian procurement, East Africa for early hominid obsidian studies, Mesoamerican obsidian studies, but mainly the North American Southwest since the mid-1980s.