Answer
Joseph Maguire, the former Director of the National Counterterrorism Center, served as the Acting Director of National Intelligence (DNI) from August 2019 to May 2020. He succeeded Dan Coats, who resigned from the position in July 2019. Grenell succeeded Maguire as the Acting DNI in May 2020, serving until June 2020 when he was replaced by Richard Grenell.