The individual who works on literary and historical issues is the dramaturg.
More about dramaturg:
The practice of theatrical representation and dramatic creation needs investigation, absorption, and practical application
A dramaturg serve as a researcher, liaison, interpreter, conducts outreach activities for education, writes programme notes, creates lobby displays, and determines why events in the play happen the way they do.
Pre-show discussions that can cover background information about the play and/or the production's setting are a part of the dramaturg's creative process. Post-show conversations, which typically involve some of the actors and the creative crew.
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