Anthony Stephen Fauci (; born December 24, 1940) is an American immunologist. He works for the National Institutes of Health of the United States. He is the head of the National Institute of Allergy and Infectious Diseases (NIAID) at the National Institutes of Health (NIH). He became well known in 2020 during the COVID-19 pandemic in the United States for his information about preventing the spread of disease.