He was on duty when Apophis attacked Stargate Command. When he examined the bodies of the Jaffa, he was able to determine they were not Human. (SG1: "Children of the Gods") When SG-1 was brainwashed into thinking Dr. Daniel Jackson died on the planet Oannes, he used hypnosis to discover the truth from Captain Samantha Carter's memories. (SG1: "Fire and Water")