In the first year alone, Robert Lewis' group, meeting three times a week, consisted of Marlon Brando, Montgomery Clift, Mildred Dunnock, Jerome Robbins, Herbert Berghof, Tom Ewell, John Forsythe, Kevin McCarthy, Karl Malden, E. G. Marshall, Patricia Neal, Beatrice Straight and David Wayne, to name a few.
The Actors Studio, which is still active today, became one of the leading centers for the Stanislavski System, or Method, of dramatic training, producing some of the most influential performers in American theatre and film in the later half of the Twentieth Century.