Nikolai Krogius

Nikolai Vladimirovich Krogius (first name sometimes written Nikolay) (born July 22, 1930 in Saratov) is a Russian Chess Grandmaster, International Arbiter (1985), psychologist, chess coach, chess administrator, and author. He won several tournament titles at Sochi and in eastern European events, and appeared in seven Soviet finals from 1958–71. His peak was in 1967 when he ranked 18th in the world for a time. He earned his doctorate in psychology, and specialized in sports psychology. He coached World Champion Boris Spassky for several years, also served as chairman of the USSR Chess Federation, and co-authored five chess books. He was the co-winner of the 1993 World Senior Chess Championship.

Source: Nikolai Krogius on Wikipedia.