Modern Reiki began during the 1920s in Japan with the practice of Mikao Usui. Most Reiki practitioners worldwide practice a form of Usui Reiki Ryoho, which translates as “Usui’s system of natural healing.” Unfortunately, World War II interrupted the development of Reiki, and it was through a single teacher, Hawayo Takata, who had learned Reiki in Japan but lived in Hawaii, that Reiki was introduced globally. In the last twenty-five years, Reiki teachers around the world have been reunited with Usui’s Japanese lineages.