Robert Druskin , the head of Citigroup 's corporate and investment bank , was named chief operating officer , filling a role that has been vacant since Robert B. Willumstad left in July 2005 .
Robert Druskin
Citigroup
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Robert B. Willumstad
Citigroup
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PERSON
Robert Druskin
ORGANIZATION
Citigroup
PERSON
Robert B. Willumstad