He was the son of Albert Niemann, a well known tenor with the same name.
He later trained in pediatrics as an assistant at the Säuglingsheim (infant home), run by the Verein Säuglingskrankenhaus in Berlin.
His primary area of research dealt with metabolism in infancy.
[1] He was the author of Kompendium der Kinderheilkunde mit besonderer Berücksichtigung der Säuglingskrankheiten (Compendium of pediatrics with special reference to infant diseases; 1920).
This article about a German person in the field of medicine is a stub.