About Mas Oyama
Masutatsu Ōyama, commonly known outside Japan as Mas Oyama, was a Korean-Japanese karateka. He was the founder of Kyokushin Karate, considered the first and most influential style of full contact karate. His family name was Lee and Oyama said he was his very first teacher. At sometime between 1946 and 1950, Mas Oyama trained at Kanbukan, a dojo founded by high ranking students of Kanken Toyama known for its large degree of Zainichi Korean membership. In 1958, Oyama wrote What is Karate, which became a best-seller.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.