Ch'a Min-su (also called Jimmy Cha), Korean pro 4 dan, born 1951, attained 4 dan rank in 1984, emigrated from South Korea to the United States in 1984.
Also well known as a highly successful professional poker player. Cha routinely earns $1,000,000 a year at poker. There is a biographical article about him in the Agora Black & White series on GoBase.
Big article about his life on thecasinodb.com.