Norm was a world authority on the biology of retrovirus infections in nonhuman primates and was the discoverer of the SIV and the immunodeficiency disease it causes in rhesus macaques. He set the standard for the use of the SIV-infected rhesus monkey model to understand the immunopathogenesis of AIDS and to assess the efficacy of HIV-1 vaccine candidates. Above and beyond these professional accomplishments, Norm was a consummate collaborator, who fostered the development of large research teams that made remarkable progress in AIDS research. He was a loyal friend to his colleagues, a wise mentor to both trainees and collaborators, and an honest and caring advisor to all with whom he worked.