Tal Celes was a Bajoran Starfleet crewman who served aboard the Federation starship USS Voyager. By 2376, Celes was a grade three sensor analyst assigned to Voyager's astrometrics department under Seven of Nine, the department's head.
Celes especially had difficulty with sensor data analysis. As a sensor analyst, her work had to be constantly double-checked much to Seven of Nine's immense irritation. Often, Celes had to call upon her closest friend on Voyager, crewman William Telfer, to help her with the analyses.
Captain Janeway took Celes, Telfer, and Mortimer Harren on a survey mission on the Delta Flyer, hoping to inspire them to better performance. Celes was nervous, especially toward Janeway. When the Delta Flyer was damaged during the mission, Celes suggested that the damaged piece be beamed aboard to try to determine the cause of the impact by scanning it for a quantum signature. The idea proved fruitless in the end, but Celes redeemed herself when she refused to abandon Janeway when a swarm of dark matter lifeforms advanced on the Flyer.