Proistamenos
The word Rector is used often in the Orthodox Christian Church as the title of the priest who is in charge of a parish or in an administrative leadership position in a theological seminary or academy.
The word rector is derived from the Latin regere, to rule, and has a number of meanings and usages all of which refer to someone who is in charge. The word rector is used in many languages, in varying forms indicating secular as well as religious positions of someone who is in a position of authority.