This essay discusses a less known period of Karl Mannheim's life, namely the period he spent in Hungary. I attempt to point out that the career of the young Mannheim, starting from a philosophical interest and continuing with a sociological one, is continuous. His first published works and letters prove that in the period preceding his emigration to Germany in 1919 he was concerned with questions that received their mature form in his sociology of knowledge. They include primarily the question of culture, that of perspective-boundedness (relativity) of cognition, interpretation and the problem of intellectuals. Despite changing disciplines from philosophy to sociology, the continuity of his oeuvre can be shown.