After the war in 1945 he was appointed Professor of Economics as successor of Herman Frijda, who was murdered in Auschwitz.

[3] Among his doctoral students were Jan Pen (1950), Henri Theil (1951), Arnold Heertje (1960), and Joop van Santen [nl] (1968).

This touched the essence of Hennipman's ideas which consequences can be found in his 1962 Doeleinden en criteria der economische politiek (Purposes and criteria of economic policy ), his 1966 De taak van de Mededingingspolitek (The role of the Competition policy), and appeared in his 1977 Welvaartstheorie en economische politiek, translated into English and published in 1995, entitled Welfare Economics and the Theory of Economic Policy.

His publications show that Hennipman builds on the ideas of the subjectivist Austrian School (including Eugen von Böhm-Bawerk), and Lionel Robbins' Essay on the Nature and Significance of Economic Science (1932).

They may confessed that besides material (monetary) also non-material matters are in play, but in practical effects that are often left as they are.