His top private students pay $6000 per year or more , and they 're happy to do it .
He 's the author of many books and articles about martial arts , and he teaches martial artists and business people throughout North America .
author 's top private students pay $6000 per year or more , and they 're happy to do it .
He 's the author of many books and articles about martial arts , and he teaches martial artists and business people throughout North America .