1971. Nicholas Christofilos came to the University of California Radiation Laboratory (now Lawrence Livermore National Laboratory) in 1956 and pursued a novel approach to magnetic fusion energy, the Astron project. Born in Boston, he grew up in Greece, where he received a degree in engineering and privately studied physics while working for a company that installed and maintained elevators. Christofilos invented and patented the concept of alternate gradient (strong) focusing for particle accelerators and came to the United States in 1953 to stake his claim after the concept was independently invented by researchers at Brookhaven.
More information: Nicholas C. Christofilos: His Contributions to Physics (PDF)