Friedrich Loeffler
He worked with Robert Koch from 1879 to 1884[1] as an assistant in the Imperial Health Office in Berlin.In 1884, he became staff physician at the Friedrich Wilhelm Institute in Berlin, and four years later became professor at the University of Greifswald.[2] His development of original methods of staining rendered an important and lasting service to bacteriology.[2] Early in his career, he began a study of parasitic diseases.His description of the diphtheria bacillus, published in 1884, was the originating cause of an antitoxin treatment.