Discusses his early life and education; choosing physics as a career, studying at Columbia University, his expertise in radio engineering; building the cyclotron at Columbia and cyclotrons in general; the discovery of fission, his thesis being withheld from publication for secrecy reasons; experiments with the cyclotron; working on the uranium experiments with Fermi. Prominently mentioned are: I. I. Rabi, Lucy Harner, John R. Dunning, E. T. Boothe, Sheldon Glassow, Leo Szilard, and Walter H. Zinn.