Dr. Anthony Fauci is an American physician and immunologist who has served as the director of the National Institute of Allergy and Infectious Diseases (NIAID) since 1984. He is known for his work in researching and combating infectious diseases, including HIV/AIDS, Ebola, and most recently, the COVID-19 pandemic. Fauci has played a key role in shaping public health policy and has advised multiple U.S. presidents on health issues. His expertise and leadership during health crises have made him a prominent figure in the field of medicine and public health.