[2] In 1905, after spending some time as a lexicographer at the Thesaurus Linguae Latinae at Munich, Klotz became a lecturer (Privatdozent) at the University of Strasbourg and cultivated a friendship with the historian of religion Richard August Reitzenstein.
His tenure was interrupted by the First World War: rising to the rank of Hauptmann (captain), he participated in the Battle of the Somme and suffered an eye injury.
[1] An expert in source criticism, he showed an interest in the Greek precedents of Roman authors, resulting in publications on the historical writers Appian, Livy and Valerius Maximus.
[1] According to a biography of Klotz by classicist Klaus Stiewe, his contributions to source criticism were his most lastings scholarly legacy since many of his findings remained unrivalled until the late 20th-century.
Buchner Verlag [de], had commissioned the book in order to supplement the existing literature in accordance with the government's ideological views.