Cyril J. Bergtheil
Cyril Jonas Bergtheil (2 December 1878 – 25 August 1973) known from around 1916 as Cyril Jonas Berkeley was an English chemist, bacteriologist, and zoologist of German ancestry. He worked in India from 1902 to 1912 serving as an Imperial Bacteriologist and later collaborated with his wife Edith Berkeley in studies on polychaetes.