Tom Brughmans is Associate Professor of Classical Archaeology at the Centre for Urban Network Evolutions, Aarhus University. His research explores how social networks connected people throughout history, how large integrated economies like the Roman Empire could function for centuries, and how expansive communication systems using fire and smoke signaling worked. Matthew A. Peeples is Associate Professor of Anthropology in the School of Human Evolution and Social Change, and Director of the Center for Archaeology and Society at Arizona State University. His research focuses on integrating archaeological data with methods and models from the broader social sciences to address questions regarding the nature of human social networks over the long term.