Prof Theobald Smith FRS(For) HFRSE (July 31, 1859 – December 10, 1934) was a pioneering epidemiologist, bacteriologist, pathologist and professor. He is widely considered to be America's first internationally significant medical research scientist. His work included the study of Texas cattle fever and the epidemiology of cattle infected by ticks transmitting protozoa. He also discovered a species of Salmonella, named for his chief Daniel E. Salmon, and studied anaphylaxis, then referred to as Theobald Smith phenomenon. Smith taught at Columbian University (now George Washington University) and established the school's department of bacteriology, the first at a medical school in the United States. He also worked at Harvard University and the Rockefeller Institute.