Tiit-Rein Viitso (4 March 1938 – 2 December 2022) was an Estonian linguist.[1]
In 1962, he graduated from Tartu State University in Estonian philology. From 1965 to 1973 he worked at Tartu State University's Computational Centre (Estonian: TRÜ arvutuskeskus). During 1973–1993 he worked at Estonian Language Institute, and from 1986 – at Tartu State University (now, the University of Tartu).[1]