sentences: "Libby was active in the Defense Policy Board Advisory Committee of the Pentagon when it was chaired by Richard Perle during the early years of the George W. Bush administration (2001–2003).At various points in his career, Libby has also held positions with the American Bar Association, been on the advisory board of the RAND Corporation's Center for Russia and Eurasia, and been a legal adviser to the United States House of Representatives, as well as served as a consultant for the defense contractor Northrop Grumman.