SANDRA BAMFORD is an associate professor and chair of anthropology at the University of Toronto Scarborough. She is the editor of The Cambridge Handbook of Kinship, coeditor of Beyond Kinship: The Genealogical Model Reconsidered, and the author of Biology Unmoored: Melanesian Reflections on Life and Biotechnology.

MARILYN STRATHERN is a professor emeritus of social anthropology at Cambridge University and Hon. Life President of the UK Association of Social Anthropologists (ASA). She is the author of Relations: An Anthropological Account and Kinship, Law, and the Unexpected: Relatives Are Always a Surprise.