Bacteriologist. He is best known for his pioneering studies of parasites, and of insects as carriers of disease. He studied at the University of California and the University of Gottingen, before moving to England in 1899 and taking British citizenship a year later. He was elected Professor of Biology at Cambridge in 1906, where he created the Molteno Institute of Biology and Parasitology in 1921. He founded and edited two scientific journals, the "Journal of Hygienen" and "Parasitology" as well as contributing 150 articles to other professional publications. He is best remembered for his discoveries in immunology, life in aseptic conditions, blood chemistry and diseases carried by ticks. He also investigated the distribution of mosquitoes in relation to outbreaks of malaria in England. He later identified clostridium perfringens, the organism that causes gangrene and showed the role of intestinal bacteria in digestion. In 1931 he was made Emeritus Professor of Biology at Cambridge, and continued to live in England until his death at age 75.

Bacteriologist. He is best known for his pioneering studies of parasites, and of insects as carriers of disease. He studied at the University of California and the University of Gottingen, before moving to England in 1899 and taking British citizenship a year later. He was elected Professor of Biology at Cambridge in 1906, where he created the Molteno Institute of Biology and Parasitology in 1921. He founded and edited two scientific journals, the "Journal of Hygienen" and "Parasitology" as well as contributing 150 articles to other professional publications. He is best remembered for his discoveries in immunology, life in aseptic conditions, blood chemistry and diseases carried by ticks. He also investigated the distribution of mosquitoes in relation to outbreaks of malaria in England. He later identified clostridium perfringens, the organism that causes gangrene and showed the role of intestinal bacteria in digestion. In 1931 he was made Emeritus Professor of Biology at Cambridge, and continued to live in England until his death at age 75.

Bio by: js