Thomas Barfield is professor of anthropology at Boston University. His books include The Perilous Frontier: Nomadic Empires and China, 221 BC to AD 1757; The Central Asian Arabs of...view moreThomas Barfield is professor of anthropology at Boston University. His books include The Perilous Frontier: Nomadic Empires and China, 221 BC to AD 1757; The Central Asian Arabs of Afghanistan; and Afghanistan: An Atlas of Indigenous Domestic Architecture.view less