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David Aaron Kessler (born May 13, 1951) is an American pediatrician, attorney, author, and administrator (both academic and governmental) serving as Chief Science Officer of the White House COVID-19 Response Team since 2021. Kessler was the commissioner of the Food and Drug Administration (FDA) from November 8, 1990, to February 28, 1997. He co-chaired the Biden-Harris transition’s COVID-19 Advisory Board from November 2020 to January 2021 and was the head of Operation Warp Speed, the U.S. Wikipedia