What is the author's style in Brecht on Theatre: The Development of an Aesthetic by Bertolt Brecht?

The author's background is that of a theorist and practitioner experienced and knowledgeable about both his message (Marxism / Socialism) and the medium (the theatre) through which that message is to be delivered. His expertise is of both the intellectual and actual sorts - he didn't just think about these theories, he applied them to his work and as a result, transformed those theories based on what he learned. In that sense, he was in some ways a social scientist. His reasons for writing were grounded in his socio-political beliefs.