Robert Gallo, M.D., is the co-discoverer of HIV. His research group demonstrated that HIV causes AIDS. He developed the HIV blood test. And he was the first to discover a human retrovirus (the human T cell leukemia virus). Today, at age 80, Dr. Gallo is the director of the University of Maryland Medical School’s Institute of Human Virology. He’s still in the lab—as shown in this video from the Institute—currently overseeing several studies, including an HIV vaccine.