About Mikao Usui
Mikao Usui was the father of a form of energy medicine and spiritual practice known as Reiki, used as an alternative therapy for the treatment of physical, emotional, and mental diseases. According to the inscription on his memorial stone, Usui taught Reiki to over 2,000 people during his lifetime. Eleven of these students continued their training to reach the Shinpiden level, a level equivalent to the Western third degree, or Master level. It seems that all students of Usui received five principles to live by and those with a further interest in the teachings became dedicated students. Usui was raised as a samurai from childhood, specifically in the martial arts techniques of aiki (合氣術).
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.