T'Kreng was a female Vulcan who lived in the 24th century. T'Kreng was a honored professor of the Vulcan Science Academy and had previously been a Captain in Starfleet. T'Kreng was a winner of two Nobel-Zee-Magnees Prizes for her work on quantum chronodynamics and singularity matrices.
In 2371, Starfleet consulted with T'Kreng after another USS Defiant was found near Earth and which was determined to be thousands of years old. T'Kreng later boarded the Vulcan research vessel Sreba and travelled to Deep Space 9, where T'Kreng took the ship into the Bajoran wormhole and into the Gamma Quadrant. The Sreba was later attacked and boarded by the Unclean, who killed T'Kreng, but also absorbed her cerebral cortex into their organic "living computer", which allowed her to assist the Defiant crew in helping to repel the Unclean. (DS9 - Invasion! novel: Time's Enemy)