In-depth interview covering family background; early education at Brigham Young; work at Bell Labs (Harvey Fletcher) before graduate studies at University of Chicago (A. A. Michelson). Appointment to University of California. Church life vs. university career. Establishment of the Acoustical Society of America; Knudson becomes the 3rd president. Research on acoustics in building, work on ear sensibility, audio amplifier; designs hearing aids with Isaac H. Jones; absorption of sound in gases and air. Consultant to MGM. Early work at UCLA; design of radio broadcasting studios. Work during World War II. Deanship at UCLA, and later chancellorship; relationship with Dijkstra and with Spoone. Later work in architectural acoustics; the academic senate; attitudes and philosophy. Minority problem at the university.