In the mortgage business, Mark Oman already had the biggest house on the block. Now he's planning to add a wing.

As chairman and chief executive officer of Norwest Mortgage, Mr. Oman runs the largest originator and servicer of residential mortgages in the country. This week his company's parent, Norwest Corp., announced plans to merge with Wells Fargo & Co. - a move that is likely to increase the Des Moines-based mortgage company's dominance.

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