disease that is passed between humans and animals. He emphasized, "between animal and human medicine there are no dividing lines---nor should there be." William Osler (1849--1919) worked with Virchow and was interested in the linkages between human and veterinary medicine.James H. Steele (1947)Founded the Veterinary Public Health Division at Centers for Disease Control (CDC) recognizing that good animal health is important for good public health and played an important role in the public health response to diseases such as rabies, brucellosis, salmonellosis, Q fever, bovine tuberculosis, and leptospirosis.Calvin Schwabe (1927--2006)Made many important contributions to veterinary epidemiology over his career. He established Department of Epidemiology and Preventive Medicine at the Veterinary School, the first department of its kind at a veterinary school. In 1964 he wrote a monograph (*VeterinaryMedicine and Human Health*) in which he proposed that veterinary and human health professionals should collaborate to combat zoonotic diseases and coined the term 'One Medicine' which emphasizes the similarities between human and veterinary medicine.The Wildlife Conservation Society, 29 September 2004Brought together a group of human and animal health experts for a symposium at Rockefeller University in New York City. Attendees of this symposium, titled "Building Interdisciplinary Bridges to Health in a 'Globalized World'," discussed the movement of diseases among humans, domestic animals, and wildlife. The symposium set 12 priorities, so called the Manhattan Principles, to combat health threats to human and animal health and called for an international, interdisciplinary approach to prevent disease and formed the basis of the 'One Health, One World' concept.Ronald Davis, MD, President