Dr. Stephen M. Folga is a senior manager in the Risk and Infrastructure Science Center at Argonne National Laboratory. He has been involved for more than 15 years in projects related to infrastructure assurance. During that time, he contributed to the development of systems analysis methodologies to use in natural gas and petroleum fuels infrastructure assessments. He also developed methodologies for estimating the potential consequences of component disruption and the time needed to return disrupted components into service. Dr. Folga has helped to determine the interdependencies between the natural gas and petroleum infrastructures with other critical energy infrastructures, such as electric power and telecommunications.