Harris was a highly-placed Section 31 operative in the 2150s.
Harris had entered into a covert alliance with Krell, a Klingon fleet admiral, who was attempting to contain an outbreak of a deadly plague which was sweeping throughout the Klingon Empire. Harris agreed to facilitate the abduction of Doctor Phlox to Qu'Vat Colony, where Phlox was to assist Doctor Antaak in developing a cure. In exchange, Krell led Harris to believe that both the Empire and Starfleet would benefit. When then-Lieutenant Reed began investigating Phlox's kidnapping, Harris contacted his old student, ordering him to stall Enterprise so that Phlox could complete his "assignment." When Reed asserted that he did not work for Harris anymore, Harris told him that Section 31's "recruitment policy" did not allow agents to leave.
Reed reluctantly carried out his assignment, and attempted to sabotage Enterprise's mission to find Phlox, but his treachery was discovered by Captain Archer, who had Reed put in the brig. Eventually, Reed informed Archer about Harris, and Archer told Reed to put him in contact with Harris. Reed did so, and Harris told Archer that, if Phlox was successful in finding a cure to the plague, the Klingon Empire would stabilize, which would be a benefit to Starfleet. Archer, however, was suspicious of Harris' motives.
Later, Reed contacted Harris for help in approaching Terra Prime's base on Mars undetected. Harris informed him that, due to terraforming, Mars' atmosphere was much thicker than the detection grid was originally designed for, and that a shuttlepod would be able to approach undetected as long as it stayed close to the surface, but that they would still need to reach the surface undetected. When Reed told him that they had devised a way to accomplish that without Harris' help, Harris responded by saying, "The student has surpassed the teacher," before wishing Reed good luck. (ENT: "Terra Prime")
