George C. Williams (biologist) should only be used where it is really necessary", and, that, when it is necessary, selection among genes or individuals would in general be the preferable explanation for it. He elaborated this view in later books and papers, which contributed to the development of a gene-centered view of evolution; Richard Dawkins built on Williams' ideas in this area in the book "The Selfish Gene". Williams was also well known for his work on the evolution of sex, and was an advocate of evolutionary medicine. In later books, including "Natural Selection: Domains, Levels and Challenges", Williams softened his views on group
Group Selection (book) Group Selection (book) Group Selection is a 1971 book edited by George C. Williams, containing papers written by biologists arguing against the view of group selection as a major force in evolution. The group of biologists writing on a single unified (if somewhat broad) theme contrasts with Williams' earlier seminal 1966 book "Adaptation and Natural Selection", whose arguments Williams suspected to be his alone. In particular it contains a reprint, with an erratum, of W.D. Hamilton's classic 1964 paper on inclusive fitness, "The Genetical Evolution of Social Behavior" plus a paper by John Maynard Smith entitled "The Origin and Maintenance