Hermann Wiener
Hermann Ludwig Gustav Wiener (15 May 1857, Karlsruhe – 13 June 1939, Darmstadt) was a German mathematician. Education and career. Hermann Wiener, whose father was the mathematician Christian Wiener, graduated from the "Gymnasium" in Karlsruhe. From 1876 to 1879 he studied mathematics and natural science at the "Polytechnische Schule Karlsruhe" (now the Karlsruhe Institute of Technology). From 1879 to 1882 he studied at the Technical University of Munich under Felix Klein and Alexander von Brill and in 1881 at the University of Leipzig. In 1881 he received his "Promotion" (PhD) in Munich in mathematics with a thesis "Über Involutionen  auf ebenen Curven" (On involutions on plane curves) under the supervision of Ludwig Seidel. In Karlsruhe in 1882 he passed the state examination for secondary school teachers. He was from 1882 to 1883 a "Lehramtspraktikant" (teaching trainee) at the "Gymnasium" in Karlsruhe and from 1882 to 1883 his father's assistant at the "Polytechnische Schule Karlsruhe". In 1885 Hermann Wiener habilitated at the Martin Luther University of Halle-Wittenberg with a thesis "Rein geometrische Theorie der Darstellung binärer Formen durch Punktgruppen auf der Geraden" (Purely geometrical theory of the representation of binary forms by point groups on the line). From  1885 to 1894 he was a "Privatdozent" at the Martin Luther University of Halle-Wittenberg. In 1894 he was appointed a professor ordinarius at "Technische Universität Darmstadt" (TU Darmstadt), where he retired as professor emeritus in 1927. In 1890 Wiener was one of the founders of the German Mathematical Society ("Deutsche Mathematiker-Vereinigung", DMV). He was elected in 1895 a member of the German National Academy of Sciences Leopoldina ("Deutsche Akademie der Naturforscher Leopoldina") and was appointed in 1907 "Geheimer Hofrat" (Court Councillor).