Masutatsu (Mas) Oyama was born Yong I-Choi on the 27th of July, 1923 in a village not far from Gunsan in Southern Korea.
At a relatively young age he was sent to Manchuria, in Southern China, to live on his sister's farm. At the age of nine, he started studying the Southern Chinese form of Kempo called Eighteen hands from a Mr. Yi who was at the time working on the farm. When Oyama returned to Korea at the the age of 12, he continued his training in Korean Kempo.
                   

In 1938, at the age of 15, he travelled to Japan to train as an aviator, to be like his hero of the time, Korea's first fighter pilot. Survival on his own at that age proved to be more difficult than he thought, especially as a Korean in Japan, and the aviator training fell by the wayside.

He did however continue martial arts training, by participating in judo and boxing,and one day he noticed some students training in Okinawan Karate.
This interested him very much and he went to train at the dojo of Gichin Funakoshi at Takushoku University, where he learned what is today known as Shotokan Karate.

His training progress was such that by the age of seventeen he was already a 2nd dan,and by the time he entered the Japanese Imperial Army at 20, he was a fourth dan. At this point he also took a serious interest in judo, and his progress there was no less amazing. By the time he had quit training in Judo, less than four years after he had started, he had achieved the rank of fourth dan in Judo.
The defeat of Japan in world war II and the subsequent indignity of occupation almost proved to be too much for Mas Oyama, who nearly despaired.Fortunately for all of us, So Nei Chu came into his life at that time.
Master So, another Korean (from Oyama's own province) living in Japan, was one of the highest authorities on Goju Ryu in Japan at the time.
He was renowned for both his physical and spiritual strength. It was he who encouraged Mas Oyama to dedicate his life to the martial Way.
It was he too who suggested that Oyama should retreat away from the rest of the world for 3 years while training his mind and body.

When he was 23 years old, Mas Oyama met Eiji Yoshikawa, the author of the novel Musashi, which was based on the life and exploits of Japan's most famous Samurai. Both the novel and the author helped to teach Mas Oyama about the Samurai Bushido code and what it meant. That same year, Oyama went to Mt. Minobu in the Chiba Prefecture, where Musashi had developed his Nito-Ryu style of swordfighting. Oyama thought that this would be anappropriate place to commence the rigours of training he had planned for himself.
Among the things he took with him was a copy of Yoshikawa'sbook. A student named Yashiro also came with him.
The relative solitude was strongly felt, and after 6 months, Yashiro secretly fled during the night. It became even harder for Oyama, who wanted more than ever to return to civilisation. So Nei Chu wrote to him that he should shave off an eyebrow in order to get rid of the urge. Surely he wouldn't want anyone to see him that way! This and other more moving words convinced Oyama to continue, and he resolved to become the most powerful karate-ka in Japan.

Soon however, his sponsor informed him that he was no longer able to support him and so, after fourteen months, he had to end his solitude. A few months later,
in 1947, Mas Oyama won the karate section of the first Japanese National MartialArts Championships after WWII.
However, he still felt empty for not having completed the three years of solitude. He then decided to dedicate his life completely to karate-do. So he started again, this time on Mt. Kiyozumi, also in Chiba Prefecture.
This site he chose forits spiritually uplifting environment.
This time his training was fanatical 12 hours a day every day with no rest days, standing under (cold) buffeting waterfalls, breaking river stones with his hands, using trees as makiwara, jumping over rapidly growing flax plants hundreds of times each day. Each day also included a period of study of the ancients classics on the Martial arts, Zen, and philosophy.

After eighteen months he came down fully confident of himself, and able to take control of his life. Never again would he be so heavily influenced by his society around him. (Though it is probably safe to say that his circumstances were also probably never again as traumatic!)

In 1950, Sosai (President/founder) Mas Oyama started testing (and demonstrating) his power by fighting bulls. In all, he fought 52 bulls, three of which were killed instantly, and 49 had their horns taken off with knife hand blows.
That it is not to say that it was all that easy for him. Oyama was fond
of remembering that his first attempt just resulted in an angry bull. In 1957, at the age of 34, he was nearly killed in Mexico when a bull got some of his own back and gored him. Oyama somehow managed to pull the bull off and break off his horn. He was bedridden for 6 months while he recoverd from the usually fatal wound.
Today of course, the animal rights groups would have something to say about these demonstrations, despite the fact that the animals were already all destined for slaughter.

In 1952, he travelled the United States for a year, demonstrating his karate live and on national televison. During subsequent years, he took on all challengers, resulting in fights with 270 different people. The vast majority of these were defeated with one punch! A fight never lasted more than three minutes, and most rarely lasted more than a few seconds.
His fighting principle was simple, if he got through to you, that was it.

If he hit you, you broke. If you blocked a rib punch, you arm was broken or dislocated. If you didn't block, your rib was broken. He became known as the Godhand, a living manifestation of the Japanese warriors' maxim Ichi geki, Hissatsu or "One strike, certain death". To him, this was the true aim of technique in karate. The fancy footwork and intricate techniques were secondary (though he was also known for the power of his head kicks).

In 1953, Mas Oyama opened his first "Dojo", a grass lot in Mejiro in Tokyo.In 1956, the first real Dojo was opened in a former ballet studio behind Rikkyo University, 500 meters from the location of the current Japanese honbu dojo (headquarters). By 1957 there were 700 members, despitethe high drop-out rate due to the harshness of training.


Practitioners of other styles came to train here too, for the jis-sen kumite (full contact fighting).
One of the original instructors, Kenji Kato, has said that they would observe those from other styles,and adopt any techniques that "would be good in a real fight". This was how Mas Oyama's karate evolved. He took techniques from all martial arts, and did not restrict himself to karate alone.

The Oyama Dojo members took their kumite seriously, seeing it primarily as a fighting art, so they expected to hit and to be hit. With few restrictions, attacking the head was common, usually with the palm heel or towel-wrapped knuckles. Grabs, throws, and groin attacks were also common.
Kumite rounds would continue till one person loudly conceded defeat. Injuries occurred on a daily basis and the drop out rate was high (over 90%).
They had no official do-gi and wore whatever they had.

The current World Headquarters were officially opened in June 1964, where the name Kyokushin, meaning "Ultimate truth" was adopted. From then, Kyokushin continued to spread to more than 120 countries, and registered members exceed 10 million making it one of the largest martial arts organisations in the world.

Sadly, Sosai Mas Oyama died, of lung cancer (as a non-smoker), at the age of 70 in April 1994, leaving the then 5th dan Matsui in charge of the organisation.

 
Kaicho Toru Tezuka
Kyokushinkai Tezuka Group

Toru Tezuka was born on March 2nd, 1942, in Tokyo, Japan.
His sister, Masako, became Sosai Oyama’s secretary while she was a college student. 
 Toru Tezuka first heard of Mas Oyama in 1956, as Sosaï's bare hand fights against bulls made the newspapers and television
Toru Tezuka met Mas Oyama for the first time in 1960 when he was in college. They became very good friends. Sosai soon encouraged Toru Tezuka to join the Kyokushin Kaikan, but Toru Tezuka was too busy doing extracurricular activities.
In 1964, after graduation, Toru Tezuka became a business man as well as an industrial designer. He finally answered Sosaï's call and started as one of his students in 1973.
After Sosai gave him orders to attend the general meetings, Toru Tezuka also joined the Kyokushin Kaikan as a committee member of the Organization.
In 1974, Toru Tezuka established the first dojo at Chiba according to Sosai Oyama's principles and started his teaching. Toru Tezuka received the rank of Shodan from Mas Oyama in August 1976. He organized the first tournament in Chiba in 1979.
Many talented fighters participated in this tournament,including Matsui, a student of the Tezuka dojo. Matsui trained with Toru Tezuka from his ca 4th year till ca his 14th year.
Over the course of the following years, Toru Tezuka became a Shihan at Kyokushin Kaikan, established 12 dojos in the Chiba Prefecture, and held another 10 tournaments in Chiba.


Dan history :
1976 :1st Dan from Mas Oyama
1980 :2nd Dan from Mas Oyama
1982 :3rd Dan from Mas Oyama        
1985 :4th Dan from Mas Oyama  
1989 :5th Dan from Mas Oyama
1995 :6th Dan
1997 :7th Dan
2000 :8th Dan

After the sudden death of Sosaï Oyama on April 26th,1994, the Kyokushin KaiKan organization went into chaos in Japan and worldwide. Mas Oyama had left no testament or official instructions regarding his successor as head of the organization, and the ongoing disputes and divisions within the organization greatly troubled the elder shihans in Japan.
After several years of consultation, the council of elder shihans in Japan chose to elect Toru Tezuka as the head of the International Kyokushinkai Karate Organization and asked him to continue Sosai's work. They felt Shihan Tezuka was the most representative of what they wished the International Karate Organization to become.
Toru Tezuka was a wise man, very sincere and honest, and he had been Mas Oyama's closest friend for well over 30 years. Now a highly respected businessman and influential man in Japan, Toru Tezuka was open-minded and understood the trends that would allow Kyokushinkai Karate to develop worldwide in Sosaï's spirit, without deviating from its fundamental mission.

Unfortunately, soon after beginning his mandate in the Organization, Toru Tezuka was hospitalized for more than 18 months.
When he returned, one of his members had taken over the organization on his own.
Again, confusion was overwhelming the IKO which quickly split into 3 groups: IKO1, IKO2 and IKO3, under self-proclaimed leaders. Each of these groups took a different direction in reference to Sosaï Mas Oyama's original teachings and karate philosophy.
In this turmoil, Toru did not try to fight for power in the fractured IKO.
He wisely kept away from these troubled organizations and continued doing what Mas Oyama had told him to do.
In the year 2000, Toru Tezuka was elected IKO KaiKan world representative with the power to officially approve high level representatives throughout the world for the IKO Kyokushin Kaikan Tezuka Group. For Kaicho Tezuka, as well as for all his members the principes of the Bushido (samurai codeof chivalry), "Gi (skill)", "Yû (superiority,gentleness)", "Rei (example)", "Makoto (faith)", "Meiyo (honor)" and "Chûgi (loyalty)" constitute a way of life that gives the respect, and makes it the first duty of the karateka.
Today Toru Tezuka is relentlessly pursuing an international mission whose objective is to gather and karateka worldwide in the true spirit of Mas Oyama's teachings.
He travels throughout the world and continues to build the KyokushinKai organization according to Mas Oyama's true principles.

"The International Karate Organization Tezuka Group promotes the teaching of Kyokushin Karate to honorable men and women worldwide. It is taught in the spirit of humility, respect, courteousness, and non-violence in accordance with the great principles defined by Mas Oyama the founder of Kyokushin Karate."