Jacob Joseph “Jack” Lew, 57, is currently the White House Chief of Staff. A graduate of Harvard and Georgetown, he also served as the Director of the U.S. Office of Management and Budget (OMB) in the Clinton and Obama Administrations, and was a Deputy Secretary of State for Management and Resources.
Actually, Lew will most likely sign his name in a more legible script if confirmed to the Treasury position. Retiring Secretary of the Treasury Tim Geithner, has the second worst signature in DC (he blames his grammar school training in New Delhi), and he changed his signature for his dollars.
Past U.S. Treasury Secretaries include: Alexander Hamilton, Henry Morgenthau, Jr., W. Michael Blumenthal, Robert Rubin, and Lawrence Summers.