1962-65: Personal bodyguard for Korean President, Park Chung Hee

1965: Served with the Korean Army Military Police and Korean C.I.D.

1965-66: Personal Security Officer for the ROK Ambassador to Vietnam

1965-67: Instructed members of the U.S. Marine Personal Security Unit

1966: Bodyguard of American President Lyndon B. Johnson during his visit to Korea

1967: Instructed U.S. Army Green Beret detachments in Vietnam

1968-71: Instructed Bodyguards for Vietnam Prime Minister Nguyen Cao Ky

1969: Appointed Chairman of Korean/Vietnamese Hapkido Association

1971: Opened Flying Tiger Hapkido Studio in Hong Kong and was appointed chairman of the South- East Asia Hapkido Association

1973-76: Leading star in eight major Martial Arts Movies in Hong Kong

1977: Appointed by Royal Saudi Bahrain family to instruct the Prince of Bahrain as well as Palace Bodyguards

1982-86: Instructed Irvine California S.W.A.T. and El Toro Marines

1990: Founded World United Martial Arts Federation

1990: Received 10th Dan Black Belt

1993: Instructor to U.S. DEA and U.S. Marshals

1993: Instructor to the White House Athletic Center Founder and Chairman of Preventive Action Security Services