 Regnier became editor-in-chief of "Tintin" magazine in 1966 and remained so until 1974.In this period, he moved the magazine away from the classic "Ligne claire" of Hergé and Edgar Pierre Jacobs, because the main authors published new stories less frequently, and because the magazine suffered from the success of new French magazines like "Pilote".Greg introduced a more adult genre, with less perfect heroes and more violence.