Master Um and Master Martial Arts is simply the best. Our two sons (ages 12 and 9) have been studying Tae Kwon Do for over three years with Master Um, and they love it. I'm there for every lesson my kids take, and Master Um is exceptionally patient and terrific with kids of all ages. With every kid I've seen him work with he's able to be kind yet firm, and teach them not only martial arts, but respect, self-discipline and a positive attitude. He very quietly models resolve, patience and compassion for the kids (and adults), and he's very humble and self effacing about it. He's a pretty incredible teacher, and we're so happy we've found Master Martial Arts for our boys. Plus he's Willie's teacher (and several other of the Nelson boys)! What more do you need to know?!