Juan Isa was president of the Federación Internacional de Béisbol Amateur from 1969-1975. During his time, FIBA saw the breakaway of the Federación Mundial de Béisbol Amateur. When the two merged in 1976, Isa's presidency ended. He helped restart the Amateur World Series in 1969 after a 16-year hiatus. He also served as president of the Netherlands Antilles Olympic Committee from 1972-1981.
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