Hamilton is Co-Chair of the National Security Preparedness Group. He was appointed to the Congressional Commission on the Strategic Posture of the United States. He was appointed to the National War Powers Commission, a private, bipartisan panel led by former Secretaries of State James A. Baker III and Warren Christopher, to examine how the Constitution allocates the powers of beginning, conducting, and ending war. Hamilton served as co-chair of the Iraq Study Group, a forward looking, bi-partisan assessment of the situation in Iraq, created at the urging of Congress. Hamilton served as Vice-Chair of the 9/11 Commission and co-chaired the 9/11 Public Discourse Project, established to monitor implementation of the Commission’s recommendations, the President's Homeland Security Advisory Council, the FBI Director’s Advisory Board, the Defense Secretary’s National Security Study Group, the US Department of Homeland Security Task Force on Preventing the Entry of Weapons of Mass Effect on American Soil, and co-chair of the National Advisory Committee to the Campaign for the Civic Mission of Schools with Justice Sandra Day O'Connor. He was a member of the President Bush’s (43) Foreign Intelligence Advisory Board.
Hamilton is a graduate of DePauw University and Indiana University school of law. Before his election to Congress Hamilton practiced law in Chicago, Illinois, and Columbus, Indiana. Hamilton is the author of A Creative Tension - The Foreign Policy Roles of the President and Congress; How Congress Works and Why You Should Care; and co-author of Without Precedent: The Inside Story of the 9/11 Commission and The Iraq Study Group Report.