Weinberger, whose interest in the theatre extended beyond mere legal questions, was intimately involved with the Provincetown Players and their work. He was close to founder George Cram Cook and his wife Susan Glasspell, and also to Eugene O'Neill. Weinberger was legal advisor and one of the directors of the Experimental Theatre, an organization growing out of the Provincetown Players. Papers concerning this group as well as the Provincetown Players are filed in this section.