A man by the name of Mikao Usui (died 1930), who was principal of the Doshisha university in Kyoto, Japan and also a Christian minister created the traditional technique. He took residency at a Zen Buddhist Monastery and studied ancient healing techniques. And he later had a three-week period of meditation, fasting and prayer on Mt. Koriyama in Japan. There he was struck with light in his third eye and saw the symbols used for traditional and contemporary Reiki healing.
There are many versions of his life story.
He received the Reiki Master degree from Usui at 47 in 1925
She was one of the 1st women to become a Reiki Master by Hyashi in 1941.
She helped bring Reiki to the U.S.