Marc-André Gustier is an American-born geophysicist at the University of Western Brittany. He addressed the 2005 Atlantis Conference on the subject of Spartel Island, now submerged just beyond the Strait of Gibraltar, but above sea level during the last Ice Age. Prof. Jacques Collina-Girard had proposed Spartel as a possible location for Atlantis four years earlier. Gutscher subsequently(a) withdrew his support for a Spartel Atlantis.
Gutscher’s theory was attacked on the grounds that no advanced civilisation existed 12,000 years ago. Although Gutscher retracted his earlier position, Collina-Girard has stubbornly continued to espouse his views, expanding his argument in a 2009 book.