As head of the hugely successful GM Card, Ronald Zebeck feasted on bankers' lunch. Now this card maven, holding his finger to the wind, is testing credit card ideas at Fingerhut, a big catalog merchandiser with a growing presence in home shopping and electronic delivery.

Not long ago, Ronald N. Zebeck was in the catbird's seat. As managing director of General Motors' GM Card, he presided over the fastest-growing credit card ever sent out of the chute. Millions of Americans saw his name emblazoned on representations of the card appearing in television, newspaper and magazine ads.

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