I am a Professor in the School of Anthropology. My research interests center on the evolution of human technological and social behavior. My primary research tool is the study of stone artifacts. I am currently involved in collaborative archaeological fieldwork and laboratory projects investigating Paleolithic sites and assemblages in Serbia, Morocco and China as well as the Levant. I received my Ph.D. in Anthropology from the University of New Mexico in 1990. After a brief stint at Loyola University in Chigao I joined the faculty at the University of Arizona in 1994. I have been a visiting professor at the Institute for Vertebrate Paleontology and Paleoanthropology in Beijing 2015/2016, 2019) sponsored by the Chinese Academy of Sciences, and a resident scholar at the University of Cologne in 2009/2010, funded by a Research Award from the Alexander von Humboldt Stiftung. In 2017 I received the Award for Excellence in Archaeological Analysis Lithics) from the Society for American Archaeology