This is a crucial week for David C. Mulford, the Treasury Department's under secretary for international affairs, and he is thriving with the pressure.

As the nation's point man on international economic policy, Mr. Mulford is responsible for exchange market policies and debt negotiations. Those are the hottest buttons being manipulated in Washington this week, where the world's finance leaders are convening for the annual meeting of the World Bank and the International Monetary Fund.

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