Answer the following question: What type of details about johan witteveen can be gathered from the following bio? Bio: hendrikus johannes '' johan '' witteveen -lrb- born 12 june 1921 -rrb- is a dutch economist , retired politician , and author . he was a member of the senate -lrb- 1958 -- 63 ; 1971 -- 73 -rrb- and the house of representatives -lrb- 1963 ; 1965 -- 67 -rrb- for the people 's party for freedom and democracy . he was minister of finance -lrb- 1963 -- 65 ; 1967 -- 71 -rrb- and managing director of the international monetary fund -lrb- 1973 -- 78 -rrb- . he also wrote books on universal sufism and economics .
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