Dr. Langham was an Area 51 scientist assigned to study the mimicking devices left behind by the aliens who gained a foothold of the SGC back during the third year of SG-1's operation (3.14 "Foothold"). He staged his own death and assumed the identity of a David Swidel. He was involved in selling the mimicking technology to The Committee, a group of businessmen who were establishing patents based on alien technology. This technology was used in framing Colonel Jack O'Neill in the assassination of Senator Kinsey. In exchange for his cooperation, Dr. Langham was sent to another planet to protect him from his own assassination, in the episode, 6.14 "Smoke And Mirrors".
--DeeKayP 15:38, 23 Sep 2004 (PDT)