Keith is a Professor of Radiology and Neurology at Harvard Medical School, Associate Radiologist and the Director of Molecular Neuroimaging in the Division of Nuclear Medicine and Molecular Imaging (Department of Radiology) at MGH, Associate Physician and Staff Neurologist in the Memory Disorders Unit at the Brigham and Women’s Hospital, and co-director of the Neuroimaging Program of the Massachusetts Alzheimer’s Disease Research Center.