Alger "Duke" Chapman, vice chairman of ABN Amro Inc., has taken on the duties of president of Chicago-based ABN Amro Investment Services Inc., the U.S. brokerage arm of the Dutch banking company's LaSalle Bank.Mr. Chapman, 68, who is also chairman and chief executive officer of the unit, succeeded Thomas Ryan as president.

Mr. Ryan, 48, left the company to pursue other interests, an Amro spokeswoman said. No other information was available, she said.

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