The work of Stanisław Ruziewicz
Antiquitates Mathematicae, Tome 7 (2013).
Stanislaw Ruziewicz was born in 1889. He studied at the Jan Kazimierz University in Lvov in the years 1908-1913. Doctorate under the direction of J. Puzyna received in Lvov in 1912, received his Habilitation in 1918. The associate professor was in 1920, and the ordinary professorship in 1924. He got chair position on one of four mathematics departments at the Jan Kazimierz University (other chairs of departments were Eustachy Żyliński, Hugo Steinhaus and Stefan Banach).
Source: 
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Władysław Wilczyński. The work of Stanisław Ruziewicz. Antiquitates Mathematicae, Tome 7 (2013). https://geodesic-test.mathdoc.fr/item/ANME_2013__7_292876/