His father, Hugo Iltis, was a teacher at the Brno Gymnasium, a botanist and geneticist, and a vocal opponent of Nazi eugenics.
He was professor of biology at the Deutsches Gymnasium in Brünn (Brno) from 1905 to 1938, and Privatdozent of botany and genetics in the Deutsche Technische-Hochschule (German Polytechnical Institute) from 1911-1938.
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