Northern Trust Corp., Chicago, appointed David A. Highmark, currently president of its Naples, Fla., bank, to be chairman and chief executive officer of its Arizona unit, effective June 1.

Mr. Highmark is to succeed Quentin C. Johnson at the Arizona bank; Mr. Johnson is to take over as senior vice president and chief administrative officer of Northern Trust's personal financial services unit May 1.

Mr. Highmark has been president of Northern Trust Bank of Florida Naples since 1989. He is to be succeeded in Naples by Harold Tyler, currently president and chief executive of Northern Trust's north region, comprising banks in Lake Forest and Lake Bluff, Ill.

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