is professor emeritus of biology at Hampshire College in Amherst, Massachusetts. He lectures around the world and organises research on animal behaviour, especially the behaviour of canines. His latest book is How Dogs Work (2015), co-authored with Mark Feinstein.
is a professor of linguistics at Hampshire College in Massachusetts. His current work focuses on the vocal behaviour of domesticated animals and his most recent book is How Dogs Work (2015), co-authored with Raymond Coppinger.