Direktor

Etymology
From.

Noun

 * 1) principal administrator of a school
 * 2) director leader of an organisation
 * 3)   title of a Beamter ("Public servant") in the senior service after second promotion

Usage notes
(1) Direktor is used in common language. The actual official title of a principal in Germany is (for elementary schools) or  (for secondary schools). (3) The title is always preceded by a prefix. The most common prefix is Regierungs- ("in government administration"), in which case the full title is. In terms of hierarchy, a Direktor is comparable to a (lieutenant colonel) or  (commander).