Papers of the American playwright and director. Correspondence subject files; production material comprising research, notes, costume sketches, and drafts for plays by Bertolt Brecht, Eugene O'Neill, Arnold Wesker, Ben Shaktman and others; manuscripts; printed material (posters, playbills, programs, more); audiovisual material including audiotapes, photographs; material pertaining to Royal Court Theater in London, The Berliner Ensemble, Pittsburgh Public Theater (PPT), Theatre Nationale Populaire (TNP) in Paris, The National Endowment for the Arts; more