Taivo Arak (2 November 1946, Tallinn – 17 October 2007, Stockholm) was an Estonian mathematician, specializing in probability theory.
[2] In 1983 Arak defended his dissertation for his Russian doctorate (higher doctoral degree similar to habilitation).
From 1981 he worked at the Institute of Cybernetics of the Academy of Sciences of the Estonian SSR.
[3] In 1986 he was an Invited Speaker at the International Congress of Mathematicians in Berkeley, California.
[4] Most of his research dealt with the theory of probability.