Daniel O. Claassen, MD, MS, is Associate Professor of Neurology at Vanderbilt University in Nashville, Tennessee. He is a board-certified neurologist, with subspecialty training in movement and cognitive neuroscience, who specializes in the diagnosis and treatment of neurodegenerative disorders characterized by disruptions to cognition, behavior, and movement. Dr Claassen earned his medical degree from the Medical College of Georgia in Augusta, and completed a neurology residency at Mayo Clinic, Rochester, Minnesota, and postdoctoral training at the University of Virginia, in Charlottesville. He is a past recipient of the American Academy of Neurology clinical research training grant and his work is currently funded by the National Institutes of Health, Department of Defense, and several foundations.  Dr Claassen is the principal investigator of research studies and clinical trials that focus on finding treatments for patients who suffer from neurodegenerative disorders. The focus of his research is to understand the biologic basis of how humans regulate behavior, and the cognitive processes intrinsic to this nature. These research studies are poised to have direct translational application for clinical therapies. He leads a clinical research group  which investigates the neurobiological basis of neurodegeneration through innovative cognitive neuroscience, neuroimaging tools, and biomarker discovery using patient bio fluids. Dr Claassen has published over 100 peer-reviewed journal articles related to this research.