"Specifically, sociobiology entails using explanatory principles and empirical findings derived from evolutionary biology to describe and explain social behavior among animals, including humans. It also draws on and incorporates thinking and research in ecology, especially behavioral ecology. The contributions of biologists such as R. A. Fisher, W. D. Hamilton, Robert Trivers, and George Williams were foundational for the development and emergence of sociobiology, and that emergence culminated with the publication of Sociobiology: The Modern Synthesis by Edward O. Wilson in 1975. This chapter explores the impact of sociobiology on theory and research in sociology during the nearly four decades since the publication of Wilson’s opus. Wilson’s book is a tome, stretching to twenty-seven chapters and 697 pages of text. Had it not been for the fact that the title and subject of Chapter 27 was “Man: From Sociobiology to Sociology,” it might have been recorded in the annals of science as a magisterial synthesis of much of what was then known about the evolution of social behavior in animals, but its influence may not have extended much beyond a few other fields such as biological anthropology or comparative psychology. But by expanding the scope of his analysis to include humans, Wilson provoked one of the great intellectual and scientific debates of the late twentieth century and helped stimulate the development of entirely new programs of research in the social and behavioral sciences."