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John is a Senior R&D Engineer at Modern Electron. He has 20 years of experience working in the field of vacuum tubes and cathodes, ranging from CRT manufacturing to field emission to mass spectrometers and ion thrusters. He is a co-inventor on 4 patents and co-author on 6 publications. He has helped start-ups bring products from concept to prototype to market, and has designed and assembled hardware that has flown to Venus! John holds a B.S. in Physics from Truman State University.