stage manager

Century Dictionary and Cyclopedia

1. n. In theaters, one who superintends the production and performance or a play, and who regulates all matters behind the curtain.

Wiktionary

1. n. A person responsible for the organization of a stage production, and who is in charge of the stage during the performance

GNU Webster's 1913

1. (Theat.) One in control of the stage during the production of a play. He directs the stage hands, property man, etc., has charge of all details behind the curtain, except the acting, and has a general oversight of the actors. Sometimes he is also the stage director.

WordNet 3.0

1. n. someone who supervises the physical aspects in the production of a show and who is in charge of the stage when the show is being performed