query: Who is the current head of NASA?
passage: Jim Bridenstine
James Frederick Bridenstine (born June 15, 1975) is an American politician and the Administrator of the National Aeronautics and Space Administration (NASA). Bridenstine served as the United States Representative for Oklahoma's 1st congressional district, based in Tulsa from January 3, 2013 to April 23, 2018. He is a member of the Republican Party.
passage: Daniel Mulville
Daniel R. Mulville (born 1939) is an American engineer who served briefly as Acting Administrator of NASA in 2001.