Korean-japanese karate master (1923-1994)Masutatsu Ōyama (大山 倍達, Ōyama Masutatsu, born Choi Yeong-eui (Hangul: 최영의 Hanja: 崔永宜); July 27, 1923 – April 26, 1994), more commonly known as Mas Oyama, was a karate master who founded Kyokushin Karate, considered the first and most influential style of full contact karate