Dr. Hallett is the President of the International Federation of Clinical Neurophysiology. He also serves as the Chief of the Human Motor Control Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland. Dr. Hallett obtained his M.D. at Harvard University, interned at the Peter Bent Brigham Hospital and trained in Neurology at Massachusetts General Hospital. He had fellowships in Neurophysiology at the National Institutes of Health and at the Institute of Psychiatry in London. From 1976 to 1984, Dr. Hallett was the Chief of the Clinical Neurophysiology Laboratory at the Brigham and Women's Hospital and worked up to Associate Professor of Neurology at Harvard Medical School. From 1984, he has been at the National Institute of Neurological Disorders and Stroke where he also served as Clinical Director of NINDS until July 2000. He is past President of the American Association of Neuromuscular and Electrodiagnostic Medicine and the International Parkinson and Movement Disorder Society and also served as Vice-President of the American Academy of Neurology. He has served as Editor of many journals and books and has had many honors. His work mainly deals with principles of motor control and the pathophysiology of movement disorders. Dr. Hallett’s interests in motor control are wide-ranging, and include brain plasticity and its relevance to neurological disorders and the pathophysiology of dystonia, parkinsonism, and myoclonus. In recent years, he has become interested in disorders of volition, including tic and functional movement disorders.