Michael D. Petraglia was born in New York in 1960, and has been conducting research into the Paleolithic archaeology of South Asia since 1987. He is currently a Lecturer in the Leverhulme Centre for Human Evolutionary Studies, University of Cambridge. He has conducted archaeological research in India, Arabia and North America. He is co-editor of the book, Early Human Behaviour in Global Context: the Rise and Diversity of the Lower Palaeolithic Record. Bridget Allchin was born in Oxford in 1927, and has been conducting research into varied aspects of Indian prehistory and ethnography for more than four decades. She is currently Chair of the Ancient India & Iran Trust (Cambridge). Her books include The Stone Tipped Arrow, The Prehistory and Palaeogeography of the Great Indian Desert, and, with Raymond Allchin, The Birth of Indian Civilization, and The Rise of Civilization in India and Pakistan.