Klaus H. Aschenbrenner was born in 1932 in Germany and works as a software architect in Vienna.  He is the author of two books^[080][081] on Atlantis in which he supports the view that a collision with an asteroid in the Atlantic around 10500 BC caused the demise of Atlantis. He advocates the Azores as its location and offers geological evidence to support his contention.

In 2011 he published a paper^(a) entitled Gizeh und die erste Hochkultur (Giza and the first advanced civilization) in which he adds his support to the idea of a much earlier date for the Sphinx than is conventionally accepted. He associates the erosion of the Sphinx with increased acidity in rain caused by a cometary impact around 7600BC, which has been identified by Alexander Tollmann. English readers can use their Google translator.

^(a) http://www.klaus-aschenbrenner.de/2.html