T'Pelak was a Vulcan woman and a member of Starfleet who served as a counselor and instructor at Starfleet Academy in the 2350s. She was also a Vulcan healer. Circa 2358, she and Doctor Forbus invigilated Cadet Tasha Yar in the Priam IV test, a holodeck training simulation designed to test how Yar considered Prime Directive issues and handled decisions regarding them. T'Pelak and Forbus hypnotized Yar into believing the simulation was real. The next day, at Yar's interview with the test invigilators, T'Pelak spoke on how Yar performed. (TNG novel: Survivors)