Dr. Denys is an adult neurologist, certified by the American Board of Psychiatry and Neurology since 1978. He has been involved in research, teaching, and clinical care at CPMC since 1974. He is also a diplomate of the American Board of Electrodiagnostic Medicine. Dr. Denys trained as a neurologist at one of the oldest universities in Europe, the Catholic University of Leuven, established in 1425. He continued his training in neurology at Stanford University and the Mayo Clinic and was a fellow of the Muscular Dystrophy Association of America. Dr. Denys has extensive experience in the treatment of neurological disorders. An associate clinical professor in neurology at the University of California in San Francisco (UCSF), he also teaches physicians in training at CPMC. He is listed in the "Best Doctors in America", a national, non-membership listing of physicians based on recommendations by their peers. Dr. Denys has been very active in professional organizations. He has held numerous positions at the American Association of Electrodiagnostic Medicine, a national organization for physicians dedicated to education in the field of EMG. Dr. Denys has served as President of both the Association of the Clinical Faculty at UCSF and the San Francisco Neurological Society. He has a special interest in diseases and injuries of the peripheral nerves and the use of electrodiagnostic techniques, usually referred to as electromyography or EMG. Many of these tests are performed at the recommendation of other physicians, including neurologists. Dr. Denys has been involved in the education of physicians specializing in electrodiagnostic medicine for over 35 years. Dr. Denys has published more than 50 scientific papers and lectured extensively. Dr. Denys specializes in the use of Botulinum for the treatment of spasmodic torticollis and other movement disorders, sometimes referred to as dystonia. Botulinum is also used to treat spasticity in patients with cerebral palsy or stroke. Dr. Denys was involved in the use of Botulinum (also known as Botox®) from the very beginning, since the medication was first developed at California Pacific Medical Center by his colleague and friend Dr. Allan Scott. Many patients with neurological disorders experience pain. There can be multiple causes, some of which may be amenable to simple interventions.