This study aims to analyse, based on the theoretical framework of the French Discourse Analysis (DA), how the teacher, as subject, may (or not) assume himself or herself as an author in the school environment, using excerpts from a corpus of 15 dissertational-argumentative texts produced by subjects after discussions of texts and films related to Education. We consider DA as a theory of interpretation in which, from evidences in the linguistic materiality, it becomes possible to interpret the meanings mobilised by the subject, and to understand the operation or the mechanism of the production of these meanings.