Alberto A. GUGLIELMONE is a senior Argentinean scientist with a long career devoted to ticks and tick-borne diseases of cattle but currently specializing in the biogeography of Ixodidae worldwide. His scientific contributions encompass hundreds of papers and several books in collaboration with scientists in about 30 countries. Dr. Guglielmone is a member of the Academia Nacional de Agronomía y Veterinaria of Argentina.Santiago NAVA is a Senior Scientist in Parasitology at the Instituto Nacional de Tecnología Agropecuaria, and Scientist at the Consejo Nacional de Investigaciones Científica y Técnicas, Argentina. His scientific contribution encompasses more than two hundred of papers and a book, focused on systematics, ecology and control of ticks, and epidemiology of tick-borne pathogens. Dr. Nava has an active collaboration with scientists from more than 20 countries from America, Europe and Africa.Richard G. ROBBINS is an Emeritus Research Associate at the Smithsonian Institution. His 41-year career with four United States government agencies has yielded approximately 150 scientific publications, including six books and several book chapters and monographs, plus scores of agency-specific reports. Dr. Robbins is a life member of the Society of Federal Health Professionals and has been awarded the U.S. Army’s Meritorious Civilian Service Medal.