Method acting, known informally as the Method, is a range of training and 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.Among those who have contributed to the development of the Method, three teachers are associated with "having set the standard of its success", each emphasizing different aspects of the approach: Lee Strasberg (the psychological aspects), Stella Adler (the sociological aspects), and Sanford Meisner (the behavioral aspects). The approach was first developed when they worked together at the Group Theatre in New York and later at the Actors Studio.
Definition from Wikipedia – Method acting
Stella Adler (February 10, 1901 – December 21, 1992) was an American actress and acting teacher. She founded the Stella Adler Studio of Acting in New York City in 1949. Later in life she taught part time in Los Angeles, with the assistance of her protégée, actress Joanne Linville, who continued to teach Adler's technique. Her grandson Tom Oppenheim now runs the school in New York City, which has produced alumni such as Marlon Brando, Robert De Niro, Harvey Keitel, Elaine Stritch, Kate Mulgrew, Kipp Hamilton, Jenny Lumet, and Jeff Celentano.Irene Gilbert, a longtime protégée and friend, ran the Stella Adler Studio of Acting in Los Angeles, until her death. The Los Angeles school continues to function as an acting studio and houses several theaters. Alumni of the Stella Adler-Los Angeles school include Mark Ruffalo, Benicio del Toro, Brion James, Salma Hayek, Clifton Collins Jr., Herschel Savage and Sean Astin.
Definition from Wikipedia – Stella Adler
Lee Strasberg (born Israel Lee Strassberg; November 17, 1901 – February 17, 1982) was a Polish-born American actor, director, and theatre practitioner. He co-founded, with directors Harold Clurman and Cheryl Crawford, the Group Theatre in 1931, which was hailed as "America's first true theatrical collective". In 1951 he became director of the nonprofit Actors Studio in New York City, considered "the nation's most prestigious acting school," and in 1966 he was involved in the creation of Actors Studio West in Los Angeles.
Although other highly regarded teachers also developed "the Method", Strasberg is often considered the "father of method acting in America", according to author Mel Gussow, and from the 1920s until his death in 1982 "he revolutionized the art of acting by having a profound influence on performance in American theater and film." From his base in New York, he trained several generations of theatre and film notables, including Anne Bancroft, Dustin Hoffman, Montgomery Clift, James Dean, Marilyn Monroe, Jane Fonda, Julie Harris, Paul Newman, Ellen Burstyn, Al Pacino, Robert De Niro, Geraldine Page, Eli Wallach, and directors Andreas Voutsinas, Frank Perry and Elia Kazan...
Definition from Wikipedia – Lee Strasberg
Konstantin Sergeyevich Stanislavski (né Alekseyev; Russian: Константин Сергеевич Станиславский; 17 January [O.S. 5 January] 1863 – 7 August 1938) was a seminal Soviet and Russian theatre practitioner. He was widely recognized as an outstanding character actor and the many productions that he directed garnered him a reputation as one of the leading theatre directors of his generation. His principal fame and influence, however, rests on his 'system' of actor training, preparation, and rehearsal technique.Stanislavski (his stage name) performed and directed as an amateur until the age of 33, when he co-founded the world-famous Moscow Art Theatre (MAT) company with Vladimir Nemirovich-Danchenko, following a legendary 18-hour discussion. Its influential tours of Europe (1906) and the US (1923–24) and its landmark productions of The Seagull (1898) and Hamlet (1911–12) established his reputation and opened new possibilities for the art of the theatre. By means of the MAT, Stanislavski was instrumental in promoting the new Russian drama of his day—principally the work of Anton Chekhov, Maxim Gorky, and Mikhail Bulgakov—to audiences in Moscow and around the world; he also staged acclaimed productions...
Definition from Wikipedia – Konstantin Stanislavski