Alexandre Yersin
Alexandre Emile Jean Yersin was a Swiss and naturalized French physician and bacteriologist. He is remembered as the discoverer of the bacillus responsible for the bubonic plague or pest, which was later named in his honour .
Yersin was born in 1863 in Aubonne, Canton of Vaud, Switzerland, to a family originally from France. From 1883 to 1884, Yersin studied medicine at Lausanne, Switzerland and then at Marburg, Germany and Paris . In 1886, he entered Louis Pasteurs research laboratory at the cole Normale Suprieure, by invitation of Emile Roux, and participated in the development of the antirabies serum. In 1888 he received his doctorate with a dissertation entitled tude sur le Dveloppement du Tubercule Exprimental and spent two months with Robert Koch in Germany. He joined the recently created Pasteur Institute in 1889 as Rouxs collaborator, and discovered with him the diphtheric toxin .
Source: Wikipedia