Wolfowitz had tapped Kellems, who came from the White House and had worked at the US defence department with Wolfowitz, to become his adviser at the World Bank.

Criticism

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Kellems' arrival in June 2005 eventually touched off criticism among staff that Wolfowitz was sealing himself off with a small cadre of trusted advisors.

A special bank panel looking into Wolfowitz handling of the 2005 promotion and pay raises for bank employee Shaha Riza is also believed to be examining other employment arrangements, including Kellems.

Kellems and another close Wolfowitz adviser Robin Cleveland each are paid more than $200,000 - compensation that also has irked some bank staff.

Critics say they lacked extensive development experience.

Kellems' last day is expected to be next week. He did not say what he will do after leaving the bank.