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Masayuki Yagi is a pioneering figure in the field of nuclear analytical chemistry, with a career dedicated to advancing instrumental activation analysis and laboratory automation. His research focuses on developing robust, high-throughput methods for trace element determination in biological and environmental materials. Yagi’s major contributions include the refinement of the internal standard method for charged-particle and photon activation analysis, which significantly improved accuracy and reproducibility in complex matrices. His most cited work, “Instrumental charged-particle activation analysis of several selected elements in biological materials using the internal standard method” (1987, 21 citations), established a benchmark for non-destructive multi-element analysis. He further demonstrated his innovative approach to laboratory efficiency by designing an automatic gamma-ray spectrometer with a micro-robot for sample changing (1986, 17 citations), a precursor to modern robotic sample-handling systems. Yagi’s later work on a flexible automation system integrating small robots and local area networks (1991) showcased his forward-thinking vision for networked, automated radiochemical analysis. Though his citation counts are modest, his contributions laid essential groundwork for automated activation analysis, influencing subsequent generations of researchers in environmental monitoring and nuclear science.