He went into teaching mathematics and science , as well as administration , in secondary schools .
He was a student of Arnold Sommerfeld and Heinrich Tietze at the University of Munich , where he received his doctorate in 1939 .
student went into teaching mathematics and science , as well as administration , in secondary schools .
He was a student of Arnold Sommerfeld and Heinrich Tietze at the University of Munich , where he received his doctorate in 1939 .