(Reuters) – David Kessler, who led the COVID-19 vaccine distribution efforts for the United States, is stepping down from President Joe Biden’s administration, the Department of Health and Human Services confirmed on Friday. Kessler, a pediatrician and lawyer who headed the U.S. Food and Drug Administration under presidents George H.W. Bush and Bill Clinton, will return to teaching at the University of California, San Francisco, the New York Times reported earlier. Kessler could not be immediately reached for comment. The 71-year-old’s departure reflects the changing strategy of the Biden admi…