Covers period from 1948 through 1965, when Robert Hellwarth was an undergraduate at Princeton University, to 1952; a doctoral student at University of Oxford, to 1955; a postdoctoral student at California Institute of Technology, 1955-1956; a research scientist at Hughes Aircraft Company, 1956 on; and a visiting professor at the University of Illinois. Emphasis on the cross-fertilization of his electrical engineering and physics education; his collaboration with R. Feynman and F. Vernon on the theory of masers; Q-switching, and stimulated Raman scattering.