Thomas Richards 
At Work with Grotowski on Physical Actions [PDF ebook] 

`I consider this book a precious report that permits one to assimilate some of those simple and basic principles which the self-taught at times come to know, yet only after years of groping and errors. The book furnishes information regarding discoveries which the actor can understand in practice, without having to start each time from zero. Thomas Richards has worked with me systematically since 1985. Today he is my essential collaborator in the research dedicated to Art as Vehicle.’ — from the Preface by Jerzy Grotowski