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.