Wikipedia
Studienrat (abbreviated StR) is an official title/rank of higher teachers in the German and Austrian education system. Even though the German and Austrian education systems use the same term, there are differences in the level and usage of this rank.
Studienrat (abbreviation StR), literally meaning "Educational Councillor", is an official German title for an official or civil servant mostly in the regular state-owned grammar schools in Germany. It is a denomination for an official in the so-called "higher service" as opposed to the "elevated", "middle" and "lower" service ranks. This office is located on the 4th "service level" and remunerated according to "A 13" which marks the first salary level of "higher service" officials. The Studienrat normally works as a teacher in higher education up to the Abitur which corresponds to A-Level exams.
In the GDR Studienrat was an honorary title for a teacher.
Besides, there are also civil servants at ecclesiastical church-owned grammar schools that hold the title of a „Studienrat im Kirchendienst“ ("Educational Councillor in Church Service"), short „StR i. K.“ They are "officials of the church", on a legal basis comparable to officials of the state.
The following ranks are Oberstudienrat ("Upper Educational Councillor"), Studiendirektor ("Educational Director") and Oberstudiendirektor ("Upper Educational Direktor")