Dr. Nicholas Tripcevich is a member of the Archaeological Research Facility at the University of California, Berkeley. His research interests include Andean prehistory, social complexity, exchange theory, ethnoarchaeology, ancient mining, GIS, and lithic analysis. Dr. Kevin J. Vaughn is an Associate Professor in the department of Anthropology at Purdue University. His research interests include the emergence of social complexity, political economies of middle-range societies, craft production, ancient mining, village and household archaeology, the anthropology of pilgrimage, provenance analysis, archaeometry (INAA, LA-ICPMS, XRD, stable isotopes), ceramic analysis, Andean South America, Nasca.