Mary Maxwell, in The Sociobiological Imagination, sets an admirable array of tasks: “to acknowledge the remarkablywide influence ofa central idea, to demonstrate that the research of human biology takes place in disparate fields, and to introduce the major principles of sociobiology” (p. 9). Her unstated task is to help legitimate the presence of the paradigm of evolutionary biology in the social sciences by allowing practitioners in many social disciplines to demonstrate the usefulness of this paradigm in their work. In all these endeavors, I think she succeeds.