Early life in Hamburg, Germany; education at Darmstadt; postdoc period in Göttingen, and Bristol, England; setting up his own lab at Darmstadt as Privatdozent; origins of first of his series of books; departure due to Jewish heritage of wife; fresh start in Saskatoon; more books; limited war research; first direct contributions to astrophysics during the war years; three years at the Yerkes Observatory; forty years of work at the National Research Council in Ottawa; Nobel Prize. Experimental techniques include high resolution grating spectroscopy with photographic plates, very long absorption paths, continuous and flash discharge emission and absorption. Contributions in molecular quantum mechanics, quantum chemistry, astronomy and astrophysics, planetary and cometary atmospheres. Leitmotif is hydrogen: H, H2, H3, H3+. Also prominently mentioned are: National Socialism and World War II.