Jacob Joseph "Jack" Lew (born August 29, 1955) is the former United States Secretary of the Treasury and an American government administrator who was the 25th White House Chief of Staff from 2012 to 2013. Lew previously was Director of the Office of Management and Budget in the Clinton and Obama Administrations. He is a member of the Democratic party. He is an attorney. He has also been employed in the private sector.