 After the death of Moritz Hoernes he emerged as university professor of the Protohistorical Institute of the University of Vienna from 1917 until 1945, and furthermore he was from 1930 to 1933 professor at the University of Cairo.From 1919 to 1926 Menghin was a member of Secret Nazi Society Deutsche Gemeinschaft (the German Fellowship), in which he got to know Arthur Seyß-Inquart.In 1932 he participated in the "First International Congress of Prehistoric and Protohistoric Sciences" in London in 1932 with Hugo Obermaier and others.