SJOERD J. DE BOER is a Dutch historian and author of books on Adolf Hitler and the Second World War. For his publications and website, he regularly visits historical sites across Europe relating to Hitler and the Third Reich era. As well as specializing in the Nazi history of Munich, Berlin and the Obersalzberg, Sjoerd has also concentrated on Hitler’s service in Belgium and northern France during the First World War. He is the founder of the English-language website www.hitlerpages.com.