Grudnowski, a managing partner in Andersen Consulting in Minneapolis, its new president and chief executive officer.

Mr. Grudnowski, 49, will succeed Larry E. Rosenberger on Dec. 2. Mr. Rosenberger, 52, who said in April that he planned to step down as president and CEO, will continue to lead Fair, Isaac's research and development effort, which was his responsibility before he became CEO in 1991.

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