The contribution presents the biography of Stefan Trojar, which is divided into periods, from 1931 to 1956 (his education), from 1956 to 1977 (when he was a teacher of History and other subjects at various secondary schools), from 1977 to 2002 (when he worked at the Faculty of Arts in Ljubljana, concentrating on the professional and scientific area of Methodology of History Teaching) and after 2002 (his retirement).