Historical scholarship, despite the many changes in methodologies and models over the years, is one of the abiding missions of the discipline of theatre studies: yesterday, today, and tomorrow. Yesterday, as is well known, Theaterwissenschaft was the foundational methodology for scholarship and doctoral education. Today, of course, our approaches to theatre history encompass several dozen research methodologies and analytical models. And tomorrow? Will cultural, social, political, and intellectual histories still provide a reliable foundation? Or will we develop fields of investigation and modes of analysis that draw upon new ideas in psychology, neuroscience, and biology? One thing is clear: our methods and models will continue to change.