Harald Keres (15 November [ O.S. 2 November] 1912, in Pärnu – 26 June 2010) was an Estonian physicist [1] considered to be the father of the Estonian school of relativistic gravitation theory. [2] In 1961 Keres became a member of the Estonian Academy of Sciences in the field of theoretical physics. [2] In 1996 Keres was awarded the Order of the National Coat of Arms, Class III. [3]
Keres was the elder brother of chess grandmaster Paul Keres (1916–1975). [3] He told friendly jokes to his students: "I am not Paul's brother; Paul is my brother". [4]