Together with Milko Kos, Bogo Grafenauer, and Vasilij Melik, he is considered the co-founder of the Ljubljana School of Historiography.

After his death in 1918, the family decided to stay in the Kingdom of Yugoslavia (the Carinthian Plebiscite assigned their native region to the Republic of Austria).

In the 1930s, he was active in public life, publishing critical articles in left liberal journals, such as Sodobnost and Ljubljanski zvon.

In 1945, he moved to the Yugoslav capital Belgrade, where he worked as an expert on north-western border issues at the Ministry of Foreign Affairs.

Under the influence of the French Annales school, he introduced several methodological innovation in the study of the demographic history of the Slovene Lands.