The Cambridge Companion to American Theatre since 1945 provides an overview and analysis of developments in the organization and practices of American theatre. It examines key demographic and geographical shifts post-1945 American theatre experienced in spectatorship and addresses the economic, social, and political challenges theatre artists have faced across cultural climates and geographical locations. Specifically, it explores artistic communities, collaborative practices, and theatre methodologies across mainstream, regional, and experimental theatre practices, forms, and expressions. As American theatre has embraced diversity in practice and representation, the volume examines the various creative voices, communities, and perspectives that prior to the 1940s had been mostly excluded from the theatrical landscape. This diversity has led to changing dramaturgical and theatrical languages that take us in to the twenty-first century; these shifting perspectives and evolving forms of theatrical expressions paved the ground for contemporary American theatrical innovation.