Anjan Chatterjee, MD, is Professor of Neurology at the University of Pennsylvania. Dr. Chatterjee is a cognitive neurologist who has published widely on visual-spatial and temporal cognition, language, aesthetics and ethics. His work encompasses research with focally brain-damaged patients as well as functional neuroimaging of normal healthy subjects. He directs the Behavoral/Cognitive Neurology course at the American Academy of Neurology annual meeting, and has also served the field through membership on NIH study sections and as a question writer for Part IIB of the American Board of Psychiatry and Neurology. In 2002 he won the AAN's Norman Geschwind Prize for Research in Behavioral and Cognitive Neurology. He is an Associate Editor of the Journal of Cognitive Neuroscience, and serves on the editorial boards of Cognitive Neuropsychology, Cognitive and Behavioral Neurology, Behavi oural Neurology, Neuropsychology and Empirical Studies of the Arts.H. Branch Coslett, MD, is Professor of Neurology at the University of Pennsylvania. Dr. Coslett is a cognitive neurologist who has published widely on visual attention, the neglect syndrome, motor imagery and motor planning, temporal cognition and language. He has worked with patients with focal brain lesions, traumatic brain injury and degenerative conditions of the brain. He also employs Transcranial Magnetic Stimulation; he directs the Laboratory for Cognition and Neural Stimulation at the University of Pennsylvania. Dr, Coslett has served on numerous NIH study sections and as a member of the committee charged by the American Board of Psychiatry and Neurology with creating the Board Certification examination. He is a member of the editorial boards of Cognitive Neuropsychology, Brain and Language and Neurocase. Dr . Coslett has served on the Boards of the International Neuropsychology Society, the Academy of Aphasia and the Society for Behavioral and Cognitive Neurology.