Developments in quantum mechanics, familiarity with the old quantum theory; Edwin C. Kemble is his thesis advisor at Harvard University, 1920-1922. Comparison of Harvard and University of Wisconsin; work and collaboration with graduate students and postdocs at. Wisconsin. Research work in Europe, 1926 and after; high-frequency paramagnetism. Paramagnetic anisotropy. Teaching at University of Michigan, Stanford University, Columbia University, and Harvard University; 1930 Solvay Congress; discussions of research work and papers, 1920s-1940s; awareness of the development of solid state physics; Linus Pauling and the ligand field theory; teaching responsibilities. War work at the Radio Research Laboratory at Harvard as head of the Theory Group; the many duties on advising and reviewing committees during World War II. Chairman of Physics Department at Harvard, 1945-1949; chairmanships and other official functions during the 1950s, excitement of the renewed interest in ligand field theory (chemists); comments on personal interests.