T'Viss was a Vulcan Professor, and one of the Federation's leading temporal physicists throughout most of the 24th century.

Understanding temporal mechanics better than most others, she was disinclined to dumb down her lectures on the subject for her students. She worked with the Department of Temporal Investigations upon its founding in 2270, and worked closely with the organization until at least 2382. (DTI novel: Watching the Clock)