Dr. Walker received his PhD from Tulane University, followed by postdoctoral research at Emory and Johns Hopkins. Prior to coming to Emory, he was on the faculty in the Department of Pathology at Hopkins, where he studied β-amyloid pathology in Alzheimer’s disease and animal models of neurodegenerative disorders. In 1995 he moved to Parke-Davis/Warner-Lambert in Ann Arbor, Michigan, where he initiated studies of the prion-like induction of Aβ-amyloidosis in transgenic mouse models of Alzheimer’s disease. In 2003 Dr. Walker returned to Emory, where his research has been directed toward understanding the mechanisms by which the Alzheimer-associated proteins Ab and tau form pathogenic assemblies in vivo, how these agents spread in the brain, and the causes and consequences of vascular amyloidosis in the aging brain.