 He was a eugenicist and a social Darwinist, holding the hypothesis that as civilization advances, the less intelligent members tend inevitably to numerically outbreed the more intelligent.He was associated with the Population Reference Bureau and with "Directors of Birthright, Inc."  He was once fired from the University of Nevada for circulating among his students a paper about sex and birth control.In his work, he weighed different theoretical approaches to inducing a higher average IQ in the population particularly of the United States and Europe.