Melinda A. Zeder and Bruce D. Smith are researchers in the Archaeobiology Program of the Smithsonian's National Museum of Natural History. Daniel G. Bradley is a geneticist at Trinity College, Dublin. Eve Emshwiller is an ethnobotanist in the Botany Department at The Field Museum in Chicago. Zeder is the author of Feeding Cities: Specialized Animal Economy in the Ancient Near East and Smith is author of The Emergence of Agriculture and other books. Bradley and Emshwiller have published widely on the genetic origins of domestic animals and plants.