Arpad Emrick Elo (1903-1992) is the creator of the Elo-rating system. He was born in Hungary and moved to the US with his parents in 1913 - at the age of 10. From 1935 to 1965, Arpad Emrick Elo was a professor of physics and astronomy at Marquette University in Milwaukee (the largest city in the state of Wisconsin). After retiring, he lectured for several years at the University of Wisconsin.
He was fond of chess and was a very strong chess master. Arpad Elo spent many years to polish the accuracy and assure the integrity of the Elo-rating system in chess. He was an active participant in the United States Chess Federation (USCF) from its founding in 1939. Beside chess, he liked gardening, beekeeping, winemaking and stargazing. He was married once and had a son and a daughter.