William Luther Pierce III (September 11, 1933 – July 23, 2002) was the leader of the white separatist National Alliance organization, and a principal ideologue of the white nationalist movement. First educated as a physicist, he later worked with George Lincoln Rockwell, the founder of the American Nazi Party. He achieved notoriety as the author of the novels, The Turner Diaries and Hunter, which were written under the pseudonym Andrew Macdonald and published under the aegis of National Vanguard Books. He is also the founder of "Cosmotheism", a religion which is based on White Racialism, pantheism, eugenics, and national socialism.