George Sim Johnston wrote: People like Stephen Jay Gould, Richard Dawkins and Richard Lewontin start with a philosophical premise: There is no God, therefore a purely materialistic explanation of everything, including us, must be true. But this is ideology, not science. Lewontin, who teaches genetics at Harvard, admits as much: "We take the side of science… in spite of the tolerance of the scientific community for unsubstantiated just-so stories, because we have a prior commitment, a commitment to materialism."