Uganda New York Times world1 May 2019H. Johannes Witteveen, 97, Dies; Steered IMF Through Turbulent EraH. Johannes Witteveen, a Dutch economist and politician who, as head of the International Monetary Fund from 1973 to 1978, helped steer the world economy through some of the worst turbulence since World War II, died April 23. He was 97.