Louis Kollros

[2] After graduating in 1900, Kollros taught mathematics from 1900 to 1909 in secondary school in his hometown of La Chaux-de-Fonds.

He received his doctorate in 1905 from the University of Zurich with thesis advisor Hermann Minkowski and thesis Un algorithme pour l'approximation simultaneé de deux grandeurs.

[3] At ETH Zurich, where Marcel Grossmann taught until 1927 in the same field, Kollross held from 1909 to 1948 the francophone chair of géométrie descriptive et de géométrie euclidienne.

[4] He was president of the Steiner-Schläfli committee (tasked with the publication of their works).

[1] He wrote biographies of Évariste Galois (1949, 24 p.) and Jakob Steiner (1947, 24 p.), which appeared in the supplements to the Elemente der Mathematik (Birkhäuser Verlag).