Rochelle Paula Walensky is an American physician-scientist who served as the director of the U.S. Centers for Disease Control and Prevention from 2021 to 2023 and had also served as the administrator of the Agency for Toxic Substances and Disease Registry in her capacity as the director of the U.S. Centers for Disease Control and Prevention from 2021 to 2023. On May 5, 2023, she announced her resignation, effective June 30, 2023. Prior to her appointment at the CDC, she had served as the chief of the Division of Infectious Diseases at Massachusetts General Hospital and a professor of medicine at Harvard Medical School. Walensky is an expert on HIV/AIDS.