John C. Warner begins the interview with a discussion of his family and childhood years growing up on a farm. He developed an interest in science in high school due to the encouragement of his science teacher, G. W. Warner. He enrolled in Indiana University in 1915. There, he received his A.B. in chemistry in 1919, his M.A. in 1920, and his Ph.D. in 1923. While in college, Warner worked for the Barrett Company working on synthetic phenol processing. As a graduate student, he was a research chemist for the Cosden Oil Company. After working for Cosden for just under a year, he returned to Indiana University as a chemistry instructor while completing his graduate studies.
In 1926, he joined the faculty of the Carnegie Institute of Technology (Carnegie-Mellon University) as a chemistry instructor. Warner spent the rest of his career at Carnegie. He rose through the university ranks, eventually becoming president of the Carnegie-Mellon in 1950. Warner restructured and developed the University's chemistry department. During his time at Carnegie, he worked closely with Charles Thomas on the chemistry, metallurgy, and plutonium purification aspects of the Manhattan Project. He also served as a liaison between Oak Ridge Laboratories and Monsanto Company for this project. Warner became a board member of Jones and Laughlin, Pittsburgh Plate Glass, and served as director of Spang and Company. Warner concludes the interview with a discussion of his family and reflections on his role in the advanced educational development in Southeast Asia and the Middle East.