

In the history of economics, he is probably best known for his work On the Economic Theory of Socialism published in 1936, where he famously put Marxian economics and neoclassical economics together. Despite being an ardent socialist, Lange deplored the Marxian labor theory of value because he was very much a believer in the neoclassical theory of price.

The bulk of Lange's contributions to economics came during his American interlude of 1933–45. Oskar Lange monument at the Wrocław University of Economics Academic contributions He was deputy chairman of the Polish Council of State in 1961–65, and as such one of four acting chairmen of the Council of State (a head of state function). Oskar Lange worked for the Polish government while continuing his academic pursuits at the University of Warsaw and the Main School of Planning and Statistics. In 1946, Lange also served as Poland's delegate to the United Nations Security Council. He then renounced his American citizenship and went back to the US in the same year as the Polish People's Republic's first ambassador to the United States. Lange served as a go-between for Roosevelt and Stalin during the Yalta Conference discussions on post-war Poland.Īfter the war ended in 1945, Lange returned to Poland. Towards the end of World War II, Lange broke with the Polish government-in-exile and transferred his support to the Lublin Committee (PKWN) sponsored by the Soviet Union. Lange stressed how reasonable Stalin was prepared to be (Stalin told him of the Soviet desire to preserve an independent Poland under a coalition government), and asked the State Department to put pressure on the exiled Polish leadership to reach an understanding with the Soviet leader. Lange returned to the United States at the end of May and met, at Roosevelt's request, with Prime Minister Stanisław Mikołajczyk of the government-in-exile, who was on a visit in Washington. Lange's trip to the Soviet Union in 1944 caused further controversy, as the newly established Polish American Congress condemned him and defended the interests of the London-based Polish government-in-exile. The State Department was opposed to Lange traveling as an emissary because they felt that his political views represented neither Americans of Polish descent nor American public opinion in general. Roosevelt to obtain a passport for Lange to visit the Soviet Union in an official capacity, so that Stalin could speak with him personally he also proposed offering him a position in the future Polish cabinet. Joseph Stalin, who identified Lange as a person of leftist and pro-Soviet sympathies, prevailed on President Franklin D. Lange became a professor at the University of Chicago in 1938 and was naturalized as a U.S. In 1934, a Rockefeller Foundation fellowship brought him to England, from where he emigrated to the United States in 1937. From 1926 to 1927 Lange worked at the Ministry of Labor in Warsaw, and then was a research assistant at the University of Kraków (1927–31). He studied law and economics at the University of Kraków, where he defended a doctoral dissertation in 1928 under Adam Krzyżanowski. His ancestors had emigrated at the beginning of the 19th century from Germany to Poland. Lange was born in Tomaszów Mazowiecki as son of the Protestant manufacturer Arthur Julius Lange and his wife Sophie Albertine Rosner.
