Brett P. Giroir
is an American pediatrician and a four-star admiral in the U.S. Public Health Service Commissioned Corps. In February 2018 he was appointed Assistant Secretary for Health under the Trump administration. He concurrently serves as the Secretary's principal public health and science adviser, the senior adviser for the Health Resources and Services Administration, the Centers for Disease Control and Prevention, and the Substance Abuse and Mental Health Services Administration as well as the Senior Adviser to the Secretary for Opioid Policy. In 2020, he assumed the additional roles of the director of the U.S. coronavirus diagnostic testing, and the U.S. representative on the World Health Organization Executive Board. He stepped down as director of the U.S. coronavirus diagnostic testing to return to his primary duties as assistant secretary for health in mid-June 2020.