Dr. Cavallo is an energy consultant based in Princeton, NJ, and a physicist with the US Department of Homeland Security. His PhD degree in physics is from the University of Wisconsin (Madison). He spent six years in Europe working on nuclear fusion experiments (Max Planck Institute for Plasma Physics in Munich and the French Atomic Energy Commission in Paris). He returned to the U.S. in 1981 to work at the Princeton Plasma Physics Laboratory, where he continued in the experimental fusion program. He later moved to the Center for Energy and Environmental Studies at Princeton University, working on indoor air quality and on intermittent energy utility integration issues. As part of this effort, the wind/CAES (compressed air energy storage) system, which economically transforms intermittent wind energy into a fully controlled energy source, was developed. He has also done research on aerosols, dose to the lung from radioactive particulates (radon progeny/radon in uranium mines), and radiation risk regulation. Following the renewable energy systems research, in an attempt to understand how renewable energy can compete with fossil fuels he became interested in resource limitations on fossil fuels, particularly petroleum and natural gas, and any impact such constraints might have on U.S. security. His recent articles on fossil fuel supply include World Oil (April 2006) and Oil & Gas Journal (June 6 & 13, 2005).