Houston Stewart Chamberlain was a British-German philosopher who wrote works about political philosophy and natural science. His writing promoted German ethnonationalism, antisemitism, and scientific racism; and he has been described as a "racialist writer". His best-known book, the two-volume Die Grundlagen des neunzehnten Jahrhunderts, published 1899, became highly influential in the pan-Germanic Völkisch movements of the early 20th century, and later influenced the antisemitism of Nazi racial policy. Indeed, Chamberlain has been referred to as "Hitler's John the Baptist".