Hugh Auchincloss Brown
Robert Rengifo was a little known Chilean professor who flourished in the early decades of the 20th century. He had an intense interest in the prehistory of America and presented his views in the Proceedings of the prestigious Societe Scientifique du Chili(The Scientific Society of Chile) from 1904 until 1935. He focused on the aboriginal peoples of Chile and in particular Patagonia in the extreme south. His attention was drawn even further south to Antarctica where he controversially concluded that man had originated (rather than Africa). Then following a catastrophic axial pole shift that destroyed Atlantis, which was located in Antarctica, people were forced to migrate, populating the rest of the Americas and then the world.
Rafael Videla Eissmann, who has championed Rengifo’s work has drawn attention to an excerpt from the epic poem, La Araucana, by Alonso de Ercilla y Zúñiga (1533-1594) which translates from the original Castilian as
“Chile, fertile and known land
in the famous Antarctic region
from ancient nations respected
because of being strong, important and powerful”.
Eissmann believes that this suggests knowledge of an ancient Antarctic polar civilisation!
While many of his conclusions may now appear purely speculative, in fact, Rengifo thought his views would eventually be vindicated by archaeology. The Monte Verde site in southern Chile has since been dated to around 11,000 BC. In addition, the enormous dressed stone blocks of El Enladrillado, also in Chile, raise questions about the technological capabilities of the region’s early inhabitants.
This apparent movement of peoples from south to north was endorsed by Arthur Posnansky in his 1919 book La Hora Futura  The ensuing half century saw more of his conclusions echoed by researchers such as Charles Hapgood, the Flem-Aths, Hugh Auchincloss Brown and Robert Argod.
(a) https://obrasrafaelvidelaeissmann.blogspot.com/ (Spanish) [use search facility]
HAB Theory is named after a fictional character, Herbert Alan Boardman, in a book by Allan W. Eckert, who in turn is based on a real person, Hugh Auchincloss Brown (1879-1975), who privately published Popular Awakening Concerning the Impending Flood in 1948 and Cataclysms of the Earth in 1967, about catastrophes that have beset our planet and the threat of similar events in the furure. His core idea is that the Earth experiences a major disturbance to its axis, on average, every 5,000 years (3,000-7,100). This pole change was attributed to a continuing build up of ice at the poles that eventually will make the Earth unstable and cause the poles to shift by 90°. Brown’s second book was published in 1967 while Eckert’s fictional work was written in the late 70’s so that some of the ideas would appear to be in conflict with our current concerns regarding global warming and continuing de-glaciation.
There is also an interesting website(a) that has a link to the full text of Brown’s book although if you wish to download it, I would suggest (b) . His writing style leaves a lot to be desired but may be worth the effort. Some commentators have tried to link Brown’s HAB theory with the destruction of Atlantis and the work of Rose and Flem Ath would appear to show some influence from Brown’s work. In fact it is more likely that Eckert’s work was inspired by the theories of Charles Hapgood.