Career
Neumann travelled to Africa on several occasions, in particular between 1892 and 1894, and described many new African species. From 1900 to 1901 he traveled through Somaliland and southern Ethiopia with the German ornithologist Baron Carlo von Erlanger, clarifying the reports of earlier explorers and collecting numerous zoological specimens. From 1908, financial difficulties forced Neumann to find employment in the Walter Rothschild Zoological Museum, where he worked for many years.
Numerous zoological species bear his name, a few being: Neumann"s red-winged starling (Onychognathus neumanni).
Neumann"s warbler (Hemitesia neumanni). Philochortus neumanni, lizard from the genus Philochortus, described by Paul Matschie in 1893.