Sanford Meisner was an American actor and acting teacher who developed an approach to acting instruction that is now known as the Meisner technique. While Meisner was exposed to method acting at the Group Theatre, his approach differed markedly in that he completely abandoned the use of affective memory, a distinct characteristic of method acting. Meisner maintained an emphasis on "the reality of doing", which was the foundation of his approach.
Sanford Meisner (back row center) with members of the Group Theatre in 1938
Method acting, known as the Method, is a range of rehearsal techniques, as formulated by a number of different theatre practitioners, that seeks to encourage sincere and expressive performances through identifying with, understanding, and experiencing a character's inner motivation and emotions. These techniques are built on Stanislavski's system, developed by the Russian actor and director Konstantin Stanislavski and captured in his books An Actor Prepares, Building a Character, and Creating a Role.
Marlon Brando's performance in Elia Kazan's film of A Streetcar Named Desire exemplifies the power of Stanislavski-based acting in cinema.
A diagram of Stanislavski's "system", based on his "Plan of Experiencing" (1935)