in cattle, and its close relationship with the human tumor virus HTLV-1. Career After graduating, Hahn began her career with a fellowship from the German Science Foundation in Robert Gallo's National Cancer Institute in Bethesda, Maryland. She decided to leave Germany because she believed she would have better opportunities for research and for funding in the United States. In 1985, she joined the faculty of the University of Alabama at Birmingham (UAB) and established her own laboratory. She was a co-director of the Center for AIDS Research at UAB from 2003 to 2011. In 2011, Hahn joined the faculty of the Perelman School of Medicine at the University of Pennsylvania along with her husband and research partner George Shaw. Hahn and Shaw also work with CHAVI, a multi-institutional consortium. Hahn is the lead researcher of CHAVI's Viral Biology Team. In addition to her work in universities and as a researcher, Hahn is also a member of the American Academy of Arts and Sciences, the American Academy of Microbiology, the National Academy of Medicine, and the National Academy of Sciences. She is also a member of the advisory board of the Bill and Melinda Gates Foundation's HIV/AIDS Program and has served on numerous NIH Counsel groups. Research Hahn met Robert Gallo when she was a student at the Technical University of Munich. He was a virologist and a researcher at the National Cancer Institute in Bethesda, Maryland. Most of his research was focused on leukemia, the disease that had taken his sister's life at an early age. One of the main areas of interest for Gallo was tumor-causing retroviruses. This sparked the interest of Hahn because Bovine leukemia virus is an example of such a retrovirus. Hahn's wish to work in Gallo's lab was made possible when she received a fellowship from the German Science Foundation. Hahn left her home in Germany and started research at the National Cancer Institute on May 1, 1982. There, she began her research into the origins of HIV/AIDS. AIDS had just become prevalent in the United States a year before she arrived. All of the patients with the reported disease were gay males and displayed symptoms of a skin cancer and unique form of pneumonia. Gallo's laboratory had been studying this new disease outbreak and Hahn joined the investigation. In 1983, George Shaw joined Gallo's laboratory and he and Hahn began to collaborate on their