John M. Duncan was born on September 26, 1945 in Oak Park, Illinois.
President George W. Bush nominated John M. Duncan to be Under Secretary of the Treasury for Legislative Affairs on February 28, 2001. Mr. Duncan served as Administrative Assistant to former Senator William Roth as well as Majority Staff Director on the Senate Committee on Government Affairs. He is a native of Oak Park, Illinois, and is a veteran of the United States Army. He received his bachelor's degree from the University of Illinois and a master's degree from the Department of Urban Affairs and Policy Analysis at the New School for Social Research in New York.