Dr. Alois Alzheimer (1864-1915), a German doctor.
In 1906 described an appearance in the brain from a patient who died early, demented, which is now named Alzheimer's disease.
He was a professor of Psychology in Breslau, moving later to Munich. He was interested in histopathology, which at that time offered the prospect of explaining function from visible structure. He worked with Franz Nissl on the pathologic anatomy of mental illness.
He also published papers on cerebral arteriosclerosis in 1904 and on Huntington's chorea in 1911.
See also Univ. Illinois founders of neurology -> Alzheimer