Keith Mansfield is Associate Director for Resource and Collaborative Affairs and Chair, Division of Primate Resources, New England National Primate Research Center, Harvard Medical School, Harvard University, Southborough, US. His research focuses on primarily on the recognition of spontaneously occurring infectious diseases of nonhuman primates and their development into novel animal models to investigate disease pathogenesis. Suzette D. Tardif, Ph.D., is the Associate Director of Research at the Southwest National Primate Research Center. She is an adjunct faculty of The Barshop Institute. The Tardif laboratory's activities center on the development of the marmoset monkey as a disease model. Dr. Tardiff is a past-President of the American Society of Primatologists.