Dr. Harald N. Johnson is a distinguished virologist and naturalist known for his work studying rabies. He was raised on a farm in Nebraska, and earned his M.D. in 1933 from the University of Nebraska and his M.A. in anatomy in 1932. He began working for the Rockefeller Foundation in 1938, and worked with the Alabama State board of Health studying rabies until 1945. In 1944, he went to Mexico to conduct a field study on vampire bat rabies. During the study, he was bitten and contracted a form of rabies that left him temporarily paralyzed. He remained on the staff of the Rockefeller Institute and in 1951 became the scientific director of the Virus Research Centre in Poona India, a position he held until 1954. He returned to the U.S. where he settled in California and became the director of the Arthropod-borne Virus Project for the Rockefeller Foundation and California State Department of Public Health. In this interview, Johnson discusses the above as well as research on rabies, malaria, and arboviruses; the Salk polio vaccine field trial of 1954; his ecological approach to virus research; natural history and field studies; and memberships, awards, and publications.