Teacher's professionalism is a problem in which the question of responsibility is crutial. Because different contexts of considering this professionalism constitute his different meanings, they also constitute different understandings of teacher's responsibility. Those differences create dialectics, in which so called base sense of professionalism with its definition of material and formal responsibility (notion of H.Jonas) is being negated (in a hegelian sense), by neoliberal sense of professionalism, which is characterised, by reduction of teacher's responsibility to its formal aspect. Negation (Aufhebung) of this neoliberal sense is consequence of the dialectic logic, which we have to consider. Especially because it constitutes thinking as a matter of teacher's material responsibility.