Paul Ehrlich (1854 - 1915)

Paul Ehrlich (born 14 March 1854 in Strehlen near Breslau – died 20 August 1915 in Bad Homburg vor der Höhe) was a German physician and scientist who worked in the fields of hematology, immunology, and chemotherapy. He invented the precursor technique to Gram staining bacteria, and the methods he developed for staining tissue made it possible to distinguish between different type of blood cells, which led to the capability to diagnose numerous blood diseases.