sentences:  Bierens de Haan he founded the Journal of Philosophy "" and in the 1930s he became a leading expert in Byzantology.Working as a teacher at the Dordrecht Technical Institute in 1914, he quit his post when the Great War broke out and secured a position as war-correspondent for the Dutch newspaper Nieuwe Rotterdamsche Courant.He went into neighboring Belgium where he covered the early events of the war in Aerschot, the German war crimes at Leuven as well as the siege of Antwerp.