BETTY E. BIRINGER is currently the manager of the Security Risk Assessment Department at Sandia National Laboratories. She has developed security risk assessment methodologies for dams, high-voltage electric power transmission, chemical facilities, communities, and energy infrastructures that connect the gas industry to the electric power grid. She previously managed projects for the Office of Counterintelligence, where she developed a risk method to address the insider threat. RUDOLPH V. MATALUCCI, PhD, PE, is a retired Lieutenant Colonel in the United States Air Force and President of Rudolph Matalucci Consultants, Inc. Prior to starting his consulting firm, Dr. Matalucci was a project engineer/manager for Sandia National Laboratories, where he directed numerous risk-related projects for the Department of Energy, the Department of Defense, several other government agencies, and private organizations. He has developed, validated, implemented, and taught risk assessment methodologies for dams/locks/levees, electric power generation/transmission facilities, buildings, and other infrastructures. SHARON L. O'CONNOR is a Principal Member of the Laboratory Staff in the Security Systems and Technology Center at Sandia National Laboratories. For the last ten years, she has supported Architectural Surety and security risk assessment work. Her baccalaureate degree is from the University of New Mexico.