Socialist Oskar Lange ran Cowles Commission before leaving Chicago for Poland

Evidence

Oskar Lange, the economist star of the Cowles Commission in the later 1930s and an avowed socialist, resigned his position at Chicago in 1945 to return to his native Poland. Before leaving, Lange handpicked his successor to run Cowles to be Jacob Marschak. — Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, 811