Christopher Michael Langan (born c. 1952) is an American autodidact whose IQ was reported by 20/20 and other media sources to have been measured at between 195 and 210. Billed by some media sources as “the smartest man in America”, he rose to prominence in 1999 while working as a bouncer on Long Island. Langan has developed his own “theory of the relationship between mind and reality” which he calls the “Cognitive-Theoretic Model of the Universe (CTMU)”.