From 1919 to 1934 a researcher at the Nencki Institute of Experimental Biology of the Polish Academy of Sciences in Warsaw.

In November 1949 he became a member of the National Committee for the Celebration of the 70th anniversary of the birth of Joseph Stalin.

[2] Dembowski was a member of the Circle of Marxist Naturalists and was a leading figure for the promotion of Lysenkoism in Poland.

Jan Dembowski died, aged 73, in Warsaw, he received a state funeral and was buried at the Powązki Military Cemetery.

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