Mitsuo Yoshida (吉田 光雄 Yoshida Mitsuo, Hangul: 곽광웅 , hanja: 郭光雄 , Kwak Gwang-ung, born December 3, 1951), better known by his ring name Riki Choshu (長州 力 Chōshū Riki), is a Korean-Japanese professional wrestler who is most known for his longtime work in New Japan Pro Wrestling (NJPW) as a wrestler and a booker. He is considered one of the most influential wrestlers in Japan in the 1980s and 1990s and known as the first wrestler to popularize the Sasori-Gatame, better known in English as the Scorpion Deathlock or Sharpshooter. After Choshu left NJPW in 2002, he formed Fighting World of Japan Pro Wrestling (WJ). In October 2005, he returned to New Japan as a site foreman, a booker, and a part-time wrestler.