Philip G. Chase is a Senior Research Scientist at the University of Pennsylvania Museum of Archaeology and Anthropology. He is the author of The Emergence of Culture and The Hunters of Combe Grenal, as well as numerous articles and chapters on Paleolithic archaeology, zooarchaeology, and the origins and evolution of symbolism and culture. Andre Debenath is Professor and Director of Research at the University of Rabat and Professor Emeritus at the University of Perpignan. He specializes in the Paleolithic of the Charente River Basin, France, and of Morocco. He has excavated numerous sites in both countries, and has published more than 200 articles and several books. Harold L. Dibble is Professor of Anthropology at the University of Pennsylvania and curator in charge at the University of Pennsylvania Museum of Archeology and Anthropology. Editor of the journal PaleoAnthropology, he is the author of twelve books and has directed excavations in France, Morocco, and Egypt for over twenty-five years. Shannon McPherson is an archaeologist in the Department of Human Evolution at the Max Planck Institute. He has published on aspects of Paleolithic archaeology, lithic analysis, and the use of computers in archaeology. He is co-author, with Harold Dibble, of Using Computers in Archaeology: A Practical Guide.