But controversy followed his every move, including concerns over scientific misconduct, notably his claim to have obtained "immortal" heart cells, now shown to be fraudulent. In 1934, he authored a best-selling book Man, the Unknown based on his strongly-held conservative, spiritual, political and eugenic views, adding a belief in faith healing and parapsychology. He settled in Paris in WW2 under the German occupation, believing that the conditions would allow him to refashion the degenerate Western civilization. His extremist views re-emerged in the 1990s when they proved interesting to right-wing politicians, and in a bizarre twist, jihadist Islamists now laud his criticisms of the West.