At the American Bankers Association's bank card conference in September, Denny D. Dumler accepted a sensitive assignment as moderator of an unusual panel discussion among 10 top executives of MasterCard and Visa.

Mr. Dumler, chief executive officer of Rocky Mountain BankCard System and a card industry pioneer, was an ideal choice. He refereed with a fairness and aplomb that made him a shoo-in to do it again.

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