The world expert on stuttering is Dr. Gerald Maguire, MD. He tells his own story of medical school, etc. He is now the head of psychiatry at a major California medical school. Please have your son Goohle him. It will be assuring to him. Here's one very hopeful link. https://www.google.com/gasearch?q=Uri%20Schneider/gerld%20maguire&tbm=&source=sh/x/gs/m2/5#ip=1