Houston Stewart Chamberlain (September 9, 1855 – January 9, 1927) was a British-born author of books on political philosophy, natural science and Richard Wagner. Chamberlain married the composer's daughter some years after Wagner's death. His two-volume book Die Grundlagen des Neunzehnten Jahrhunderts, whose title translates from the original German as The Foundations Of The Nineteenth Century and which was published in 1899, became one of the many references for the pan-Germanic movement of the early 20th century, and, later, of the antisemitism of Nazi racial philosophy.