Stanley Fahn, M.D., H. Houston Merritt Professor of Neurology; Director, Center for Parkinson Disease and Other Movement Disorders, Columbia University College of Physicians & Surgeons, New York, New York

Joseph Jankovic, M.D., Professor of Neurology, Baylor College of Medicine; Director, Parkinsons Disease Center and Movement Disorders Clinic, Houston, Texas

Mark Hallett, M.D., Chief, Human Motor Control Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland

Peter G. Jenner, Ph.D., D.Sc., Professor & Head, Division of Pharmacology & Therapeutics; Director, Neurodegenerative Diseases Research Centre, Guy's, King's and St. Thomas' School of Biomedical Sciences, King's College, London, England