J.P. Morgan & Co. said Thursday it had reorganized the roles of some of its top executives and named a new head of investment banking and a new chief administrative officer.

Managing director Walter A. Gubert was tapped to lead global investment banking. He had previously been senior executive in charge of client relationships in Europe, the Middle East, and Africa.

Thomas B. Ketchum, also a managing director, is the $270 billion-asset company's new chief administrative officer, a post left vacant since Michael E. Patterson was promoted to vice chairman two years ago.

Mr. Ketchum, who was in charge of client relationships in the Americas, will not be replaced in that role, the company said.

Both Mr. Ketchum and Mr. Gubert continue to report to Douglas A. "Sandy" Warner 3d, Morgan's chairman and chief executive officer.

Succeeding Mr. Gubert, managing director Joseph P. MacHale was named senior executive for client relationships in Europe, the Middle East, and Africa. Mr. MacHale had been chief credit officer.

He was succeeded by managing director Peter D. Hancock, who also continues as head of fixed-income and futures and options trading.

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