When Jack McDonald was diagnosed with Parkinson's disease in 2001, brain surgery was the furthest thing from his mind. By 2004, Jack, the owner of a graphic design firm for thirty years, began to find it extremely difficult to meet with clients. His handwriting had became nearly illegible, he shook uncontrollably during meetings, and he found it difficult to focus on even simple tasks. In 2005 he sold his business. The next several years were spent trying most of the medications available for Parkinson's patients. Jack volunteered for a variety of drug studies, hoping to make some contribution...