Egon Karl-Heinz Bahr was a German SPD politician. The former journalist was the creator of the "Ostpolitik" promoted by West German Chancellor Willy Brandt, for whom he served as Secretary of the Chancellor's Office from 1969 until 1972. Between 1972 and 1990 he was an MP in the Bundestag of the Federal Republic of Germany and from 1972 until 1976 was also a Minister of the Federal Government. Bahr was a key figure in multiple negotiation sessions between not only East and West Germany, but also Germany and the Soviets. In addition to his instrumental role in Ostpolitik, Bahr was also an influential voice in negotiating the Treaty of Moscow, the Treaty of Warsaw, the Transit Treaty of 1971 and the Basic Treaty of 1972.

https://en.wikipedia.org/wiki/Egon_Bahr