Theo Vennemann (born May 27, 1937) is a German linguist known best for his work on historical linguistics, especially for his disputed theories of a Vasconic substratum and an Atlantic superstratum of European languages. He also suggests that the High German consonant shift was already completed in the early 1st century BC, and not in the 9th century AD as most experts believe. Born in Oberhausen-Sterkrade, he is currently a professor emeritus in Germanic and Theoretical Linguistics at the Ludwig Maximilian University of Munich.
Read more about Theo Vennemann: Theories On The Prehistory of European Languages, Reception