Graduate research on nuclear magnetic resonance at Harvard with Edward M. Purcell and Robert V. Pound, 1946-1947. Leiden postdoctoral fellowship, 1947-1948. Microwave and nuclear experiments as a Harvard Junior Fellow, 1949-1951. Early years in the Harvard Division of Engineering and Applied Physics. The 3-level maser. Nonlinear optics in the 1960s. Also prominently mentioned are: John A. Armstrong, Nikolai Gennadievich Basov, George Benedek, Francis Bitter, Felix Bloch, Gregory Breit, Vannevar Bush, Al Clogston, James Bryant Conant, William Culver, Gene Cummins, Damon, Robert Henry Dicke, Peter Alden Franken, Elsa Meints Garmire, Alexander J. Glass, Glauber, Gordon, Gorter, Grivet, William Webster Hansen, Herscher, Clarence Lester Hogan, Heike Kamerlingh-Onnes, Robert Karplus, Rudolf Kompfner, André Lallemand, Jim Meyer, Peter Pershan, Isidor Isaac Rabi, Arthur Leonard Schawlow, Julian R. Schwinger, Malcolm Woodrow Pershing Strandberg, Charles Hard Townes, John Hasbrouck Van Vleck, Shih Wang, Welton, Irvin Wieder, Wolf, Zeldovitch; American Physical Society, Bell Telephone Laboratories, Institute for Defense Analysis (IDA), International Business Machines Corporation, Lawrence Radiation Laboratory, Lincoln Laboratory at Massachusetts Institute of Technology, Radiation Laboratory at Massachusetts Institute of Technology, Netherlands Ministerie van Oderwijs en Wetenschappen, and Optical Society of America.