I beleive that he tried discussing his "theory" on ISCID. It looked link typical crank pseudoscience to me there - plenty of armwaving about how great it was but little substance.
Langan's activities in the "high IQ" world are a little more interesting. You might find this interesting - it presents the other side of a dispute involving Langan
A Reply to Chris LanganI've also heard that Langan qualified fo the Mega Society when he took the test for the SECOND time - the first time he used a pseudonym. That is against the rules and suggests that his IQ may not be as high as he claims.