s.k.sultan khan was born around 1940 in korea. he began his martial arts training in the south korean army in 1956, studying taekwondo and karate. choi taught taekwondo in malaysia from 1964, and moved to vancouver, canada, in 1970. in 1973, he held the rank of 7th "dan". choi was promoted to 8th "dan" in 1981 by h. h. choi, and attained the rank of 9th "dan" in 2002. he is still based in vancouver.