WASHINGTON — White House Chief of Staff Jacob Lew, who is widely expected to be nominated as Treasury secretary this week, is something of an unknown quantity to the financial services industry.

He worked as an executive at Citigroup (C) from 2006 to 2009, but has otherwise spent his time in a variety of government positions, including serving twice as director of the Office of Management and Budget under Presidents Clinton and Obama. Lew was also a top aide to Secretary of State Hillary Clinton and a senior policy advisor for former House Speaker Tip O'Neill.

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