Shirō Ishii

Surgeon General ; June 25, 1892 – October 9, 1959}} was a Japanese microbiologist, army medical officer, and war criminal, who served as the director of Unit 731, a biological warfare unit of the Imperial Japanese Army. Ishii led the development and application of biological weapons at Unit 731 in Manchukuo during the Second Sino-Japanese War from 1937 to 1945, including the bubonic plague attacks at Chinese cities of Changde and Ningbo, and planned the Operation Cherry Blossoms at Night biological attack against the United States. Emperor Showa rewarded him with a special service medal for his work.

Ishii and his colleagues also engaged in human experimentation, resulting in the deaths of over 10,000 subjects, most of them civilians or prisoners of war. Provided by Wikipedia