This paper revises Heidegger’s interpretation of Aristotle, in which the greek philosopher is portrayed as a proto-phenomenologist. On this regard, an attempt is made in order to render an account of Heidegger’s teaching phase (1919-1927) right before the publication of Sein und Zeit, in which Heidegger develops a search of his own philosophical terminology, resulting from the phenomenological procedure of the so-called ‘destruction’ (Destruktion) of the ontological tradition.