Riggs Bank in Washington said it named Jonathan J. Bush president, chief executive officer, and director of Riggs Investment Management Co. to succeed Philip Tasho, who had resigned.

Mr. Bush, 68, was chairman and chief executive officer of J. Bush & Co., an investment management company he founded in 1970. Riggs acquired J. Bush & Co., of New Haven, Conn., in 1997, and Mr. Bush stayed on as president and chairman.

Mark Hendrix, a spokesman for Riggs, said the 45-year-old Mr. Tasho resigned two weeks ago to pursue other endeavors.

The company also said Henry A. Dudley Jr. was named chairman of Riggs Investment's board of directors. Mr. Dudley, 53, has been a member of that board since 1994 and will handle strategic and operating management.

Riggs Investment, which has $2.3 billion of assets under management, has 53 branches in the Washington area and offices in Miami, London, and Berlin.

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