Frank Press (born December 4, 1924) is an American geophysicist. An advisor to four U.S. Presidents, he later served two consecutive terms as President of the U.S. National Academy of Sciences (1981-1993). He is the author of 160 scientific papers and co-author of the textbooks Earth and Understanding Earth.Press served on Presidential scientific advisory committees during the Kennedy and Johnson Administrations and was appointed by President Nixon to the National Science Board.