However, Lew became increasingly numbers focused, serving as the Associate Director for Legislative Affairs and Deputy Director of the Office of Management and Budget and later, the managing director of Citi Global Wealth Management and chief operating officer Citigroup Alternative Investments.

FORBES: Connect

Before he took the top operating job at the CAI division, he held the same job at Citi's Global Wealth Management division, beginning in July 2006.

WSJ: Review & Outlook: Treasury Gets a Citibanker