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
Richard Dawkins: How a Scientist Changed the Way We Think Ridley. () The reviews of the book have been mixed, but the controversial title phrase, "How a Scientist Changed the Way We Think" has been explained by considering Dawkins to have worked as an influential educator and concise author, of "The Selfish Gene", who promoted the key ideas of others about evolutionary biology, also including some controversial ideas which are not as widely accepted. As the author of a popular science book, Dawkins had popularized ideas by George Williams about group selection, William Hamilton on the theory of kin selection in evolution, biologist/geneticist John Maynard Smith on evolutionarily stable strategies,