Dr. Simpson received his medical degree from the State University of New York (SUNY) at Buffalo School of Medicine. He completed an internship in Internal Medicine at University Hospitals of Cleveland, Case Western Reserve University in Cleveland, Ohio, and a residency in Neurology at Cornell University Medical Center in New York. He completed a fellowship in Clinical Neurophysiology at Massachusetts General Hospital, Harvard Medical School, in Boston, Massachusetts.
Dr. Simpson is author of over 253 original peer-reviewed publications and ninety-seven book chapters; he has edited three books and serves on several editorial boards. He has been the principal investigator for numerous studies on subjects including the treatment of neuropathic pain in patients with peripheral neuropathy; neurological complications of HIV/AIDS; and treatment of spasticity, limb dystonia and tremor with botulinum toxin. He is Chair of the American Academy of Neurology’s Subcommittee charged with generating evidence-based guidelines for the use of botulinum toxin.
Dr. Simpson is President of the International Neurotoxin Association and a member of the American Neurological Association and the American Pain Society. He is also a Fellow of the American Academy of Neurology and the American Academy of Neuromuscular and Electrodiagnostic Medicine. In 2018, he received the Mitchell B. Max Award for Neuropathic Pain for outstanding achievements in the field from the American Academy of Neurology.