This essay by Richard Schechner dedicated to a mythical figure of the theater of the late twentieth century; a work of critical reconstruction that has contributed decisively to consolidating the legacy of Grotowski, just a few months after his death. In addition to fixing some essential terms of the vocabulary, together with the contents and the periodization of the Grotowskian work (aspects that Grotowski in life were entrusted exclusively to oral transmission), the essay retraces the formation of Grotowski, the aspects linked to his character, the specific forms of his research and his transmission of knowledge, the exercise of leadership, the role of his collaborators, the sources, the mystical side, his relationship with the spirit of time, the importance (and weakness) of his opera, in the history of twentieth century theater.