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Tatchakorn Yeerum, known professionally as Tony Jaa, is a Thai martial artist, actor, director, and stuntman. He is best known for his roles in the Ong-Bak film series, in which he performs many of his own stunts. Jaa began his martial arts training at a young age, and he has studied a variety of styles, including Muay Thai, Taekwondo, and Wushu.