After the war, Hapgood taught at Keystone College (1945–1947), Springfield College (1947–1952), Keene State College (1956–1966), and New England College (1966–1967), lecturing in world and American history, anthropology, economics, and the history of science.
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Librarians Rose and Rand Flem-Ath as well as author and former journalist Graham Hancock base portions of their works on Hapgood’s evidence for catastrophe at the end of the Last Glacial Maximum.
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Outside of Bolivia, where he is still widely read, Posnansky's writings about the Tiwanaku Site have also been made popular by authors such as Graham Hancock, Charles Hapgood, and Rand Flem-Ath, who rely on Posnansky's dating of the Tiwanaku Site to support their theories.
The book was influenced by Rose and Rand Flem-Ath's When the Sky Fell: in Search of Atlantis (1995/2009) in which they expand the evidence for Charles Hapgood's theory of earth crust displacement and propose Antarctica as the site of Atlantis.