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
Beyond Natural Selection Beyond Natural Selection Beyond Natural Selection is a 1991 book by Robert G. Wesson, published by MIT Press. Wesson argues for the case of pluralism in biology. He suggests alternative mechanisms of evolution rather than natural selection. Wesson argues that reductionism is inadequate and looks for chaos theory as an example of a different approach that is needed to explain evolution. The book provides unsolved problems that Wesson believed natural selection could not account for. The paleontologist Joseph G. Carter in a critical review for the "American Scientist" wrote the book "includes innumerable oversimplifications and misrepresentations of both evolutionary theory