Background and family, hobbies and high school education, premonitions about science; studies and state of science at Pennsylvania State University; Officer's Training during World War I; work at Westinghouse Lamp Company; effects of Depression and World War II on his career and on science, marriage; graduate work and instructor in physics at University of Colorado. AT&T work environment: comments on co-workers (in particular, Walter Brattain and William Shockley); influence of administrators on lab research policy: J. J. Carty, Frank Jewett, Mervin Kelly, Harald T. Friis, Carl R. Englund, Karl Jansky, Edmond Bruce, George Southworth, Bill Wilson, Oliver Buckley; Ohl transfers to Bell Labs, Cliffswood in 1927. Postwar work and retirement; Ohl's work in radio and semiconductors, discovery of the n-p junction, applications of electrochemical and quantum theory to the transistor; other discoveries such as the silicon solar battery; knowledge of various discoveries by colleagues; patents on discoveries, postwar input to the development of solid state physics. Also prominently mentioned are: Joseph A. Becker, Ralph Bowen, Lloyd Espenschied, Fuller, James Jeans, Oliver Lester, James O. Perrine, Jack Hall Scaff, Charles Steinmetz, Henry Theuerer; United States Army Signal Corps, and Western Electric Company.