Harald Keres
Harald Keres was an Estonian physicist considered to be the father of the Estonian school of relativistic gravitation theory. In 1961 Keres became a member of the Estonian [Academy of Sciences] in the field of theoretical physics. In 1996 Keres was awarded the Order of [the National Coat of Arms], Class III.
Keres was the elder brother of chess grandmaster Paul Keres. He told friendly jokes to his students: "I am not Paul's brother; Paul is my brother".