Citibank has hired a senior executive from Providian Financial Corp. to take charge of its $45 billion credit card business in the United States and Canada.

The Citicorp unit announced Wednesday that A. Sami Siddiqui, executive vice president of San Francisco-based Providian, will succeed Roberta J. Arena, who has overseen the bulk of Citibank's industry-leading card portfolio and related operations since January 1994.

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