Paul Ehrlich (14 March 1854 – 20 August 1915) 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. 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.
Paul Ralph Ehrlich-- (born 05/1932) is an American biologist, best known for his warnings about the consequences of population growth and limited resources. He is the Bing Professor of Population Studies in the department of Biological Sciences at Stanford University and president of Stanford's Center for Conservation Biology.
Paul Ehrlich (14 March 1854 – died 20 August 1915) was a German physician and scientist who worked in the fields of hematology, immunology, and chemotherapy. He was awarded the 1908 Nobel Prize in Physiology or Medicine.