ANDREW O. HALL, a colonel in the U.S. Army, is the Chief of Military Personnel Structure and Plans within the Deputy Chief of Staff G-1 on the Department of the Army Staff. He has served in Operations Research assignments at West Point, in the XVIII Airborne Corps Headquarters, and on the Army and Joint Staffs. His areas of research include manpower analysis, applied probability, networks and operations research. Colonel Hall holds a B.S. in computer science from West Point, a M.S. in applied mathematics from the Naval Postgraduate School and a Ph.D. in Management Science and Operations Management from the Robert H. Smith School of Business at the University of Maryland.