Distinguished for his original and numerous contributions to Bacteriology, Protozoology, Immunology, and Bacterial enzymology. In particular, for his outstanding work in establishing Clostridium oedematiens as the cause of infections necrotic hepatitis of sheep and in developing successful methods of morphology and in life cycle of Borrelomyces peripneumoniae (Nov. gen.) and in evolving complement fixation and agglutination tests for the diagnosis of pleuropneumonia contagiosa of bovines and the first laboratory vaccine for the control of this disease.