Tsuguo Sakumoto, 7 times consecutive world champion, and coach to 9 world champions including Arata Kinjo, Takuya Uemura and Ryo Kiyuna. He is 9th-dan in Ryuei-ryu karate. Ryo Kiyuna is one of Japan’s best chances to win a gold medal at the Tokyo 2020 (2021) Olympics so Sakumoto Sensei is more than ever a very busy man. Luckily he liked the portraits of him I shot in 2014 so we managed to get to interview him last September for the Sensei: Masters of Okinawan Karate Series.
You can learn more about the series, and even how to support is here: https://travel67.com/the-karate-masters-portrait-project/sensei-documentary/