Max Euwe
Machgielis "Max" Euwe, PhD (Dutch: [ˈøːwə]; May 20, 1901 – November 26, 1981) was a Dutch chess Grandmaster, mathematician, and author. He was the fifth player to become World Chess Champion (1935–37). Euwe also served as President of FIDE, the World Chess Federation, from 1970 to 1978.