Original: He served as Federal Minister of Economic Cooperation and Development from 1961 to 1966 , Foreign Minister of Germany and Vice Chancellor from 1969 to 1974 , acting Chancellor of Germany from 7 May to 16 May 1974 ( following the resignation of Willy Brandt after the Guillaume Affair ) , and finally as President of Germany from 1974 to 1979 .
Simplified: He was federal minister of economic cooperation and development ( 1961-1966 ) , but he persuaded the FDP to leave Ludwig Erhards coalition government in late 1966 .