Christopher Michael Langan is said to the smartest person alive and his IQ is assumed to be around 195-210, which is why many journalists have called him the smartest man in America or even the world. Christopher Michael Langan, is an American horse rancher and autodidact whose IQ was estimated on ABC's 20/20 to be between 195 and 210, but the fact that he is not a typical scientist or physicist as most people assume the smartest person alive would be, proves that IQ does not at all mean that the person is going to be in a specific field or be good at specific things and intelligence can be of many types.