Host Dr. Martin A. Samuels, neurologist-in-chief and chairman of the department of neurology at Brigham and Women's Hospital, and professor of neurology at Harvard Medical School, answers your questions about promising therapies for ALS, the role of exercise for Parkinson's disease patients, sleep apnea, and more. If you are a healthcare professional and have a question you want to ask the neurologist, email it to [email protected].