
Stella Adler 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 continues 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, and Jenny Lumet.

Joseph Chaikin was an American theatre director, actor, playwright, and pedagogue.

Peggy Feury was an American actress on Broadway, in films, and on television. She became a highly regarded acting teacher in New York and then in Los Angeles. Throughout her career, she taught many notable students.

Uta Thyra Hagen was a German-American actress and theatre practitioner. She originated the role of Martha in the 1962 Broadway premiere of Who's Afraid of Virginia Woolf? by Edward Albee, who called her "a profoundly truthful actress". Because Hagen was on the Hollywood blacklist, in part because of her association with Paul Robeson, her film opportunities dwindled and she focused her career on New York theatre.

Robert Lewis was an American actor, director, teacher, author and founder of the influential Actors Studio in New York in 1947.

William Hall Macy Jr. is an American actor and director. His film career has been built on appearances in small, independent films, though he has also appeared in action films. Macy has described himself as "sort of a Middle American, WASPy, Lutheran kind of guy... Everyman". Macy has won two Emmy Awards and four Screen Actors Guild Awards, as well as a nomination for the Academy Award for Best Supporting Actor for his performance in Fargo. Since 2011, he has played Frank Gallagher, a main character in the Showtime adaptation of the British television series Shameless. Macy has been married to Felicity Huffman since 1997.
David Alan Mamet is an American playwright, film director, screenwriter and author. He won a Pulitzer Prize and received Tony nominations for his plays Glengarry Glen Ross (1984) and Speed-the-Plow (1988). He first gained critical acclaim for a trio of off-Broadway 1970s plays: The Duck Variations, Sexual Perversity in Chicago, and American Buffalo. His plays Race and The Penitent, respectively, opened on Broadway in 2009 and previewed off-Broadway in 2017.

Viola Spolin was an American theatre academic, educator and acting coach. She is considered an important innovator in 20th century American theater for creating directorial techniques to help actors to be focused in the present moment and to find choices improvisationally, as if in real life. These acting exercises she later called Theater Games and formed the first body of work that enabled other directors and actors to create improvisational theater. Her book Improvisation for the Theater, which published these techniques, includes her philosophy and her teaching and coaching methods, and is considered the "bible of improvisational theater". Spolin's contributions were seminal to the improvisational theater movement in the U.S. She is considered to be the mother of Improvisational theater. Her work has influenced American theater, television and film by providing new tools and techniques that are now used by actors, directors and writers.