Stuart A. Levey is the incumbent and first Under Secretary for Terrorism and Financial Intelligence within the United States Department of the Treasury. He was sworn in on July 21, 2004. According to the Bush administration, Stuart Levey has played a central role in their efforts to combat North Korea's and Iran's illicit conduct in the international financial system. Prior to his nomination, Stuart Levey served as the Principal Associate Deputy Attorney General at the U.S. Department of Justice. He had previously served as an Associate Deputy Attorney General and as the Chief of Staff of the Deputy Attorney General.

Prior to joining the Justice Department in 2001, Mr. Levey spent 11 years in private practice at the Washington law firm Miller, Cassidy, Larroca & Lewin LLP (which merged into Baker Botts LLP). He had a litigation practice with a special emphasis on white collar criminal defense. He also clerked for Judge Laurence Silberman on the U.S. Court of Appeals for the D.C. Circuit from 1989 through 1990. In 1986 he graduated from Harvard College summa cum laude, and in 1989 he graduated magna cum laude from Harvard Law School.

On January 15, 2009 President-elect Barack Obama designated Levey to serve as Acting Treasury Secretary until Obama nominee Timothy Geithner was confirmed to the post. Geithner was confirmed on January 26th.