:::I am reasonably but not totally happy with it. I feel that it is slightly unfair to the subject, since it implies that this is merely his estimate. His estimate would seem to derive from the estimates of others, so I am not sure why it needs to be described in a way that implies it is quite this subjective. Personally I don't believe it is even necessary to state a number in the opening line. I would suggest something such as the following: "Christopher Michael Langan (born c. 1957) is an American autodidact. He is well-known for claims by himself and others that he has scored extremely high on IQ tests.[1] Billed as "by some accounts... the smartest man in America",...." etc. Possibly this is not perfect either.