Erwin Fues
Erwin Richard Fues (17 January 1893 in Stuttgart, Germany – 17 January 1970, Germany), was a German theoretical physicist who made contributions to atomic physics and molecular physics, quantum wave mechanics, and solid-state physics. Education and career. During the period 1912 to 1914, Fues studied at the University of Berlin and then the University of Munich. He served in the military in 1914 to circa 1915, and then attended the University of Tübingen from 1916 to 1918. During 1918, he became a student of Arnold Sommerfeld and he received the "doctor rerum naturalium" from the University of Munich  in 1920. From 1922 he did postgraduate work at the Stuttgart "Technische Hochschule", under Paul Peter Ewald, also a former student of Arnold Sommerfeld, and he completed his Habilitation in 1924. At Stuttgart he served as a "Privatdozent" and assistant to Ewald until 1929, during which time he worked on atomic and molecular structure and spectroscopy based on the Sommerfeld-Bohr theory. During his tenure under Ewald, he was absent from 1925 to 1927, when as an International Education Board fellow, he was first an assistant to Erwin Schrödinger at the University of Zurich, and then a research assistant at  the University of Copenhagen at Niels Bohr's Institute of Theoretical Physics. At that time three major centers for the development of quantum mechanics were the Theoretical Physics Institute at the University of Munich, under Arnold Sommerfeld, the Institute of Theoretical Physics at the University of Göttingen, under Max Born, and the Institute of Theoretical Physics, under Niels Bohr. In 1933 Fues signed the "Vow of allegiance of the Professors of the German Universities and High-Schools to Adolf Hitler and the National Socialistic State". From 1929 to 1934, he served as ordinarius professor at the Hanover "Technische Hochschule". From  1934 to 1943, he served as ordinarius professor jointly at the University of Breslau and the Breslau "Technische Hochschule", after which, he went to the Vienna Technische Universität, where he remained until 1947. In that year, he went back to the Stuttgart "Technische Hochschule", where the Institute for Theoretical and Applied Physics ("Institut für Theoretische und Angewandte Physik"), had been formed with two chairs. Fues became ordinarius professor for theoretical physics as well as director of the institute; the other joint director was Ulrich Dehlinger. The institute followed the tradition of both Sommerfeld and Ewald in carrying on with both  theoretical and experimental research and teaching. After Sommerfeld's death in 1951, Fues edited and supplemented multiple editions of two volumes of Sommerfeld's six-volume "Vorlesungen über theoretische Physik". In his career, Fues made contributions to theoretical physics, especially in atomic structure, quantum wave mechanics, and solid-state physics. In 1960, Hermann Haken took over from Fues at the Institute for Theoretical and Applied Physics.