Roger G. Johnston, Ph.D., CPP, is leader of the Vulnerability Assessment Team at Argonne National Laboratory. He was founder and head of the Vulnerability Assessment Team at Los Alamos National Laboratory from 1992 to 2007. Roger graduated from Carleton College (1977), and received M.S. and Ph.D. degrees in physics from the University of Colorado (1983). He has authored over 170 technical papers and 90 invited talks (including six keynote addresses), holds 10 U.S. patents, and serves as editor of the Journal of Physical Security.