Yockey is most famous for his book Imperium, a lengthy rant against "Rationalism" that is hailed as a work of genius by the guiding intellectuals of the racist right-wing and neo-Nazi movements. The rank and file of these movements are generally unaware of the existence of Yockey. Purporting to deal with the growth, evolution, and death of societies, this lengthy polemical rant is based loosely on the historical theories and ideas of Oswald Spengler and Friedrich Nietzsche.
Considered prophetic by many, Yockey's prescience in predicting the course of world events in the 50 years after 1948, especially the emergence of the European Union has impressed many of his followers. All we really know about this supposed "genius" is that he graduated with honors from Notre Dame University in 1941, then resigned from his job as a War Crimes Tribunal prosecutor in Germany in 1947, because he insisted his bosses made him use biased information.
Yockey and George Lincoln Rockwell were bitter enemies.