From 1907 to 1928 he served as director of the internal medicine department at the hospital, attaining the title of professor in 1910.
[2] He emigrated to Great Britain in 1938, then relocated to the United States in 1943, where he died several years later in Manteno, Illinois.
[3] While working with Ludwig Edinger he described the avian brain, and also examined the role of the olfactory system in the assessment, recognition, and ingestion of food.
[4] He described the clinical manifestations (1895) and the autopsy findings (1901) in occlusions of the arteria cerebelli posterior inferior (Wallenberg's syndrome).
[5][6] With Edinger, and later alone, he published the "Jahresberichte über die Leistungen auf dem Gebiete der Anatomie des Zentralnervensystems" (1895–1928).