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David McMahon works as a researcher at a National Laboratory, a Department of Energy facility. His research involves work on nuclear fusion and the design of nuclear-powered spacecraft. He has a master's degree in physics and a bachelor's in applied mathematics, both from the University of New Mexico at Albuquerque. He is currently doing research for a doctorate in theoretical physics in the areas of quantum field theory and the use of general relativity. Mr. McMahon is a published author. Previous work includes two books on computer programming: Rapid Application Development with Visual Basic 6 and Rapid Application Development with Visual C ++. He also wrote Quantum Mechanics Demystified, Relativity Demystified, and was a contributing writer to Ace the Technical Interview.