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He worked with Otto Lummer at the University of Breslau where he received his Ph.D in 1911, and stayed there as lecturer for two additional years before returning to the University of Edinburgh in 1912.
After a two year time working with Hermann Emil Fischer in Berlin Semmler accepted a position at the University of Breslau.
Leopold Auerbach - professor in biology and historogy at the University of Breslau (now University of Wrocław)