He later studied at the École des hautes études en sciences sociales in Paris, where he obtained a PhD in philosophy under the supervision of Algirdas Julien Greimas.

He has written on several subjects including theory of ideology, theoretical psychoanalysis, semiotics, linguistics and epistemology of humanities and social sciences.

In 1982, he also wrote a petition against such reform, together with editor Braco Rotar, social theorist Neda Pagon and jurist Matevž Krivic.

Between 1988 and 1990, he served on the board of the Committee for the Defence of Human Rights, the main civil society organization in Slovenia during the process of democratization.

Močnik also writes weekly columns in the Slovene leftist journal Mladina and is a member of the advisory board of the regional left-wing magazine Novi Plamen.

[4] In 2008, his article "Slovene historians on the Destruction of Yugoslav Federation" published in a special issue of the review Borec under the name Oddogodenje zgodovine – primer Jugoslavije' ("The Uneventment of History - The Case of Yugoslavia") together with contributions by the "new generation" of Slovenian historians and young foreign researchers such as Ozren Pupovac, Alberto Toscano and Geoffroy Geraud-Legros, became highly polemical as he criticized some trends on historical revisionism in contemporary Slovenian historiography.