Sifu James Yimm Lee Wall Hanging. Made for my Jeet Kune Do Arena room. Try it before you buy! Please Leave Reviews Below And Concerns On My Page. "Osu no Seishin". James Yimm Lee (published as James Y. Lee) was an American martial arts pioneer, teacher, author, publisher, and a welder by profession. He was a veteran of the U.S. Army. He was one of Bruce Lee's (no relation) three personally certified 3rd rank instructors and went on to teach in his absence in Oakland. James Lee mentored Bruce Lee greatly and influenced him in nutrition, weight training, and the forming of the style jeet kune do. Lee became well known for his Iron Palm and would routinely break bricks at demonstrations. He was the first to publish an Iron Palm book in America in 1957.