Peter Eeckhout is Professor of Pre-Columbian Art and Archaeology and Vice-Director of the Department of History, Arts, and Archaeology at the Université Libre de Bruxelles. His research interests include complex societies of the Americas, monumental architecture and funerary archaeology. He has been leading excavations in Peru since 1993 and is the founder and director of the Ychsma Project at the site of Pachacamac, near Lima. He is author, editor, or coeditor of several books related to Pachacamac, Peruvian archaeology and wars and conflicts in the ancient Americas, and of more than seventy book chapters and scholarly papers in international journals. Lawrence Owens lectures in bioarchaeology at Birkbeck, University of London. He specialises in the interpretation of socially oriented themes - notably diet, pathology and trauma - in ancient human skeletons. He has worked on human remains from Peru, the UK, Egypt, South Africa, the United States, Bolivia, Qatar, Spain and the Canary Islands, and he has a particular interest in the relationship between demographics, pathology and aberrant burial traditions in Andean populations. He has worked as head bioarchaeologist on the Ychsma Project at Pachacamac since 2004.