David S. Knopman, M.D., is a clinical neurologist involved in research in late-life cognitive disorders, such as mild cognitive impairment and dementia. Dr. Knopman's specific interests are in the very early stages of Alzheimer's disease, in cognitive impairment due to stroke (cerebrovascular disease) and in cognitive impairment due to frontotemporal degeneration. He is involved in epidemiology, clinical trials and diagnostic studies of these disorders.