Ernst Kummer
Ernst Eduard Kummer (born 29 January 1810, Sorau, Brandenburg; died  14 May 1893 Berlin) was a German mathematician.  At first he was a school teacher, teaching in a German high school gymnasium, where he inspired the  Leopold Kronecker to become a mathematician.  He became professor of mathematics in Breslau and then in Berlin.  He is famous for several mathematical discoveries, including his work on number fields.  Several mathematical ideas are named after him.