Dr. Robert Carneiro's fields of interest in anthropology are threefold: South American ethnology, cultural evolution, and political evolution. He has done field projects on three indigenous tribes inhabiting the Amazon basin: the Kuikuru Indians of central Brazil, the Amahuaca of eastern Peru, and the Yanoramo of southern Venezuela. Currently he is working on a study of manioc, the staple crop of most Amazonian Indians, and is about to start work on a monograph on the Kuikuru. Dr. Carneiro studies the ways in which societies have evolved from simple, autonomous Neolithic villages into ever-larger and more complex polities.