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Cheng Kwong > Klaus Pertl
Very little is know about this Sifu. He wrote a book with Lothar Hirneise called Quo Vadis Ving Tsun - Modern Views of Ancient Systems. He now retired from Wing Chun and works with Lothar on Cancer Research.
Klaus Pertl is the vice-chairman of People Against Cancer and a professional visualisation trainer (Mindstore). He has taught more than 10,000 people and has worked extensively with various form of visualisation oncology.