David Sloan Wilson is professor in the departments of biology and anthropology@Binghamton University in Binghamton, New York. He earned his Ph.D.@Michigan State University. He is an evolutionary biologist with a wide range of interests, including natural selection as a hierarchical process, the nature of intraspecific variation, the evolution of ecological communities and human evolutionary biology. He is the author most recently of Evolution for Everyone: How Darwin's Theory Can Change the Way We Think about Our Lives (Delacorte Press, 2007) and Darwin's Cathedral: Evolution, Religion and the Nature of Society (University of Chicago Press, 2002). He is also coauthor with Elliott Sober of Unto Others: The Evolution and Psychology of Unselfish Behavior (Harvard University Press, 1998). He recently collaborated with Edward O. Wilson on a major review article, “Rethinking the Theoretical Foundation of Sociobiology,” in the Quarterly Review of Biology. Address: Biology Department, Binghamton University, Binghamton, NY 13902. Internet: dwilson@binghamton.edu