Christopher Langan is considered by some to be the smartest man in America. He taught himself to read before he was four, and eventually left college because he felt he his professors could teach him little. Like others on the list, he’s had many random jobs – farmworker, forest firefighter and bouncer to name a few – but he’s best known for his “Cognitive – Theoretic Model of the Universe” which has to do with the relationship between the mind and reality. His IQ is 195.