Arpad Emrick Elo (born Élő Árpád Imre, August 25, 1903 in Egyházaskesző, Hungary – November 5, 1992 in Brookfield, Wisconsin) is the creator of the Elo rating system for two-player games such as chess. Born in Hungary, he moved to the United States with his parents as a child in 1913.
Elo was a professor of physics at Marquette University in Milwaukee, Wisconsin. He was also a chess master. By the 1930s he was the strongest chess player in Milwaukee, one of the nation's leading chess cities. He won the Wisconsin State Championship eight times.
Elo died in Brookfield, Wisconsin in 1992.