Mark A. Smith, 45, died Nov. 15. A renowned Alzheimer’s disease researcher has died after being hit by a car in Ohio. Smith was a pathology professor at Case Western Reserve University and director of basic science research at the university’s memory and cognition center. He also was executive director of the American Aging Association and co-editor-in-chief of the Journal of Alzheimer’s Disease. He is listed as the No. 3 “most prolific” Alzheimer’s disease researcher, with 405 papers written, by the international medical Journal.