WASHINGTON - Sen. Rod Grams, R-Minn., has hired former American Bankers Association president Mark W. Olson as his chief banking aide.Mr. Olson will be staff director of the securities subcommittee, of which Sen. Grams is chairman. Mr. Olson succeeds Alan L. Brubaker, who recently became associate director for external relations of the Office of Federal Housing Enterprise Oversight.

Mr. Olson, 56, retired in September as director of Ernst & Young's financial services regulatory practice and previously was president of Security State Bank in Fergus Falls, Minn. In 1986 he became the youngest banker ever elected ABA president.

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