Tsuchiya, Hiromu

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Tsuchiya, Hiromu

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  • Hiromu Tsuchiya

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Hiromu Tsuchiya was a Japanese-American assistant professor emeritus of microbiology at Washington University School of Medicine who specialized in parasitology. Born in Osaka, Japan, Tsuchiya left for the United States in 1905 to study at University of Missouri-Columbia. Over the next fifteen years, he obtained his undergraduate degree from Mizzou, and a Ph.D. in protozoology (now parasitology) from Johns Hopkins University School of Public Health. He met Jacques Bronfenbrenner, head of Bacteriology and Public Health at Washington University in St. Louis, who became his mentor. Bronfenbrenner offered him a research fellowship and, once Tsuchiya's abilities were proven, extended it for three additional years until 1934.

Tsuchiya researched various pathogenic microorganisms in the department laboratories, assisted the chief in preparation for lectures, and over time was assigned to address the students himself. He began offering his own course in 'medical zoology' in 1933 and quickly became a popular teacher. In 1934, he was promoted to the entry-level academic rank of instructor. Six years later, Tsuchiya was chosen to lead the clinical laboratories in his specialty at Barnes Hospital in 1940. In 1943, he reached the rank of assistant professor. Then, his research was directed mainly toward understanding and treating amebiasis. When Bronfenbrenner retired in 1952, Tsuchiya joined him in retirement before realizing it was too difficult. The next year, the department had changed its name to microbiology under its new chief, Arthur Kornberg, and welcomed him back to the staff.

Tsuchiya remained at Washington University until his second retirement in 1965 due to his declining health. He passed away in 1971 and named the microbiology department as his principal beneficiary.


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Creation: December 19, 2019?
Modified: June 29, 2020 10:19 AM


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  1. Portrait of Hiromu Tsuchiya in the Department of Bacteriology and Immunology, Washington University School of Medicine., VC410-S20-ss45-i04 & 5 Item Circa 1950, Part of Single Portrait Photographs.

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