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Born to a working-class family in Stettin (now Szczecin). Mittag served in a flak regiment of the Wehrmacht in the Second World War. He joined the SED in 1946 and by 1958, when he had earned his doctorate with a dissertation entitled "Problems of Socialist Development of the Transport System", he became Secretary of the Economic Commission at the Politbüro. In 1963 he became a member of parliament and (until 1971, and then again from 1979-1989) a member of the State Council of the German Democratic Republic (GDR).
Also in 1963 he became Leiter des Büros für Industrie- und Bauwesen des ZK ("Head of the Office for Industry and Construction of the Central Committee of the SED"). He and Erich Apel designed the New System for Economic Management and Planning (NÖSPL), to modernise and streamline the formerly-bureaucratic economy of the GDR. This was politically controversial and only very partially implemented.
In 1976 Mittag became Secretary for the Economy of the ZK (Central Committee of the SED). He advocated, and implemented, strict economic controls throughout his tenure. His leadership style was controversial, involving confrontations with ministers and demands for the summary dismissal of certain officials. He was particularly close to Franz Josef Strauß, and in the early 1980s arranged the so-called "Billion Loan" from West Germany.
Mittag was severely diabetic and in the mid-1980s both his lower legs were amputated. He left office after a controversy that resulted in him being taken into custody, but he was released on health grounds. In 1991 he was accused of using government funds for a private home.
- Przybylski, Peter: Tatort Politburo, 1992, ISBN 3-499-19328-0
- Hertle, Hans-Hermann: Prior to the bankruptcy of the GDR: documents of the Politburo of the CC of the SED from 1988 to the failure of the "Economic and social policy" (The Schürer / Mittag controversy). In an interview with Gerhard Schürer, Berlin 1991
- Janson, Carl-Heinz: Gravedigger of the GDR. How Günter Mittag ruined state, Düsseldorf 1991
- Mittag, Günter: At any price. In the tension between two systems, Berlin / Weimar, 1991
- Mittag, Günter: "It breaks my heart': Spiegel-interview with the former East German economic czar Günter Mittag on his policies and his errors, in Der Spiegel, 37/1991, p. 88-104.
- Günter Mittag in the German National Library catalogue
- Biographie: Günter Mittag, 1926-1994
- DDR im WWW. Personen. Günter Mittag.
- Chronik-Biographie: Günter Mittag