After only eight months on the job, Citigroup CIO Marty Lippert has resigned, leaving a tech leadership gap as the troubled institution struggles to corral a massive multinational IT infrastructure.

Citi’s chief administrative officer, Don Callahan, will assume Lippert’s duties until a replacement can be found. These duties had included heading a newly centralized global technology and operations division responsible for using the IT shop to transform Citi’s preexisting, cumbersome holding company model into a single enterprise more capable of leveraging the institution’s considerable global scale.

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