Gajo Petrović was one of the main theorists in the Marxist humanist Praxis School in the Socialist Federal Republic of Yugoslavia. He was the only one among the editors of the Praxis journal to stay in this position throughout the journal's publication. He is credited by Milan Kangrga to be the mastermind behind the Korčula Summer School, which was a meeting place for Marxists and other philosophers from the East and the West in the 1960s and 1970s.