Arnold O. Beckman is at the center of the photo, facing the camera. The other people in this image are unidentified.
Dr. Beckman (1900-2004) received a Ph.D. in photochemistry from CalTech in 1928 and taught chemistry at the university for several years. He invented the first commercially successful electric pH meter in 1934 and thus moved away from academia and into a long career manufacturing scientific and medical instruments with National Technical Laboratories, Arnold O. Beckman, Inc., and Beckman Instruments. After his retirement he devoted his life to philanthropy and specifically supporting scientific innovation.
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“Dedication of Beckman Auditorium at California Institute of Technology,” 1964. Beckman Historical Collection, Box 56, Folder 55. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1g05fb70p.
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