Lawrence Wilkerson's last positions in government were as Secretary of State Colin Powell's Chief of Staff (2002-05), Associate Director of the State Department's Policy Planning staff under the directorship of Ambassador Richard N. Haass, and member of that staff responsible for East Asia and the Pacific, political-military and legislative affairs (2001-02). Before serving at the State Department, Wilkerson served 31 years in the U.S. Army. During that time, he was a member of the faculty of the U.S. Naval War  College (1987 to 1989), Special Assistant to General Powell when he was Chairman of the Joint Chiefs of Staff (1989-93), and Director and Deputy Director of the U.S. Marine Corps War College at Quantico, Virginia (1993-97). Wilkerson retired from active service in 1997 as a colonel, and began work as an adviser to General Powell. He has also taught national security affairs in the Honors Program at the George Washington University.