Seishiro "Henry" Okazaki was born 1889 in Kakeda, Date County, in Fukushima Prefecture of Japan. He immigrated to Hawaii in the 39th year of the Meiji period (1906 A.D.) . When he was nineteen years old, he became ill while living in Hilo and was diagnosed by a doctor to have been suffering from incurable tuberculosis.

With the courage born out of desperation, he then knocked on the door of Mr. Yoshimatsu Tanaka who was then teaching Jujitsu at his Shinyukai Dojo in Hilo, and started to practice Jujitsu in earnest and in defiance of death. His frantic efforts and devotion to Judo not only miraculously healed his tuberculosis, but also enabled him to develop a strong, iron-like body.

Okazaki then realized that he owed his life completely to Judo, and the healing arts of his Sensei. He decided to devote the rest of his life to the teaching and promotion of what would become Danzan.

In 1929, Okazaki moved to Honolulu where he bought the Nikko (Rays of the sun) residence from Mr. Chester Alphonse Doyle, converted it into the Okazaki Seifukujitsu In, (Okazaki Adjustment and Restoration Clinic), and provided healing services to all people until his death in 1953.

The Nikko Restoration Sanitarium and the Danzan-Ryu dojo would become landmarks in Hawaiian history. When Franklin D. Roosevelt came to the Islands in the 30's, Okazaki was called in to massage him. When John Burn's (future governor) wife developed polio in 1935, it was Okazaki who took her on as a patient. Okazaki became a renowned healer working on the likes of Charlie Chaplan, Johnny Weissmuller, George Burns and many other notable island visitors.

Okazaki named his predominately Japanese system Danzan (Chinese meaning “Hawaiian islands” ) in deference to the islands and the spirit of aloha he believed in. Thus, the Danzan Arts came to embody aspects of Japanese, Chinese and Hawaiian cultures. Professor Okazaki was also a fierce patriot of his new country, the United States of America, and espoused its freedoms.