He subsequently worked as a Gymnasium teacher from 1927 to 1932, when he published his "Habilitation" (second book) in English Historical Linguistics (University of Vienna); he is thus an immediate successor of Karl Luick (deceased in 1935).
[2] After the war, Koziol was considered as a minor collaborator and was allowed to continue with his profession.
From 1945 to 1961, Koziol was Full Professor of English Historical Linguistics at the University of Graz before, in 1961, he took a call to Vienna to hold the "Luick" Chair in English Historical Linguistics (succeeded by Gero Bauer, Herbert Schendl and, currently, Nikolaus Ritt).
Editor and author of the revised version of Karl Luick's Historische Grammatik der englischen Sprache (1935-1940) Grammatik der englischen Sprache (1968) Englische Wortbildungslehre, 2nd ed.
(1972) Member of the Austrian Academy of Sciences (1961) Festschrift Prof. Dr. Herbert Koziol zum siebzigsten Geburtstag, ed.