Manuel Domï¿½nguez-Rodrigo is a professor of Archaeology in the Department of Prehistory of the Complutense University, Madrid. He is co-editor of Journal of Taphonomy. He has been the head of research projects on human evolution conducted in Peninj, Eyasi and Olduvai Gorge (Tanzania), as well as having participated in research conducted in Gona (Ethiopia) and Swartkrans (South Africa). He is associate researcher of the National Museums of Kenya. Rebeca Barba got her doctorate in Archaeology in the Complutense University under the supervision of MDR. She has conducted research in Peninj and Olduvai. He is associate researcher of the National Museums of Kenya. Charles P. Egeland recently recieved his Ph.D. in Anthropology from Indiana University in Bloomington. In addition to his work in Tanzania, he has conducted field and lab research in South Africa, Kenya, Germany and several U.S. states.