Sho Kosugi (ショー・コスギ, Shō Kosugi, born Shōichi Kosugi (小杉 正一, Kosugi Shōichi) on June 17, 1948) is a Japanese actor, martial artist and writer with extensive training in Shindō jinen-ryū Karate, Kendo, Judo, Iaido, Kobudo, Aikido and Ninjutsu. A former All Japan Karate Champion, he gained popularity as an actor during the 1980s, often playing ninjas. He starred in a trilogy of martial arts ninja films produced by Cannon Films (Enter the Ninja, Revenge of the Ninja and Ninja III: The Domination), before starring in the primetime television series The Master. His work helped establish ninjas in popular culture, leading to a "ninja boom" or "ninjamania" during the early-to-mid-1980s. Source: Wikipedia (en)