John Harvey Wheeler (October 17, 1918 – September 6, 2004) was an American author, political scientist, and scholar.
 He was best known as co-author with Eugene Burdick of Fail-Safe, 1962, an early cold war novel that depicted what could easily go wrong in an age on the verge of nuclear war.
 The novel was made into a movie, directed by Sidney Lumet and starring Henry Fonda, in 1964.
 In later years, Wheeler was a founding editor of the "Journal of Social and Biological Structures", 1982, and an early advocate of online education and the Internet as a democratizing tool.
 He taught a course in "OnLine Publishing" for Connected Education in the mid-to-late 1980s.
Sidney Arthur Lumet ( ; June 25, 1924 – April 9, 2011) was an American director, producer and screenwriter with over 50 films to his credit.
 He was nominated for the Academy Award for Best Director for "12 Angry Men" (1957), "Dog Day Afternoon" (1975), "Network" (1976), and "The Verdict" (1982).
 He did not win an individual Academy Award, but he did receive an Academy Honorary Award and 14 of his films were nominated for various Oscars, such as "Network", which was nominated for ten, winning four.
Mabel Elizabeth King (née Washington; December 25, 1932 – November 9, 1999) was an American film, stage, and television actress, and singer.
 She is best known for her role as Mabel "Mama" Thomas on the ABC sitcom "What's Happening!!
" from its premiere on August 5, 1976 until the end of its second season on May 11, 1978.
 King's next most remembered role is that of Evillene the Witch, a role she originated in the stage musical "The Wiz" and reprised in Sidney Lumet's 1978 film adaptation.
 She made recordings with Rama Records and Amy Records.
Eric Thal (born August 10, 1965) is an American film and stage actor, perhaps best known as Ariel in Sidney Lumet's "A Stranger Among Us"; Sam Nivens in "The Puppet Masters"; Samson in "Samson and Delilah"; Meade Howell in "The Wedding"; and Rick in "Six Degrees of Separation".
Beyond This Place is a 1957 American television adaptation from A. J. Cronin's novel, "Beyond This Place", which was originally published in 1953.
 It is not really a film, but a live production broadcast on television, and possibly preserved on kinescope.
 The show was directed by Sidney Lumet and produced by David Susskind.
 It was the third episode of the first season of "The DuPont Show of the Month", which was broadcast on CBS.
 The dramatization starred Farley Granger, Peggy Ann Garner, Torin Thatcher, Max Adrian, Brian Donlevy, and Shelley Winters.
Natalie Gold is an American actress who has appeared in film, television, and stage productions, including on Broadway.
 She is perhaps best known for playing Julia Harwell on the TV show "Rubicon", and she has appeared in many films including "Before the Devil Knows You're Dead", "I Don't Know How She Does It", "Love & Other Drugs".
 She has performed opposite Jake Gyllenhall, Naomi Watts, Cynthia Nixon, and she has been directed by Sidney Lumet.
 Gold grew up in Miami, Florida and studied theatre at the New World School of the Arts and at Emerson College.
American actor and director Morgan Freeman has had a prolific career on film, television and on the stage.
 His film debut was as an uncredited character in the Sidney Lumet–directed drama "The Pawnbroker" in 1964.
 Freeman also made his stage debut in the same year by appearing in the musical "Hello, Dolly!
" He followed this with further stage appearances in "The Niggerlovers" (1967), "The Dozens" (1969), "Exhibition" (1969), and the musical "Purlie" (1970–71).
 He played various characters on the children's television series "The Electric Company" (1971–77).
 Freeman subsequently appeared in the films "Teachers" in 1984, and "Marie" in 1985 before making his breakthrough with 1987's "Street Smart".
 His role earned him a nomination for the Academy Award for Best Supporting Actor.
 Two years later he appeared in war film "Glory" (1989), and starred as Hoke Coleburn in the comedy-drama "Driving Miss Daisy" (1989).
 Freeman won the Golden Globe Award for Best Actor – Motion Picture Musical or Comedy for his performance in the latter and also earned a nomination for the Academy Award for Best Actor.
Ralph Rosenblum (October 13, 1925 – September 6, 1995) was an American film editor who worked extensively with the directors Sidney Lumet and Woody Allen.
 He won the 1977 BAFTA Award for Best Editing for his work on "Annie Hall", and published an influential memoir "When the Shooting Stops, the Cutting Begins: A Film Editor's Story".
E. G. Marshall (born Everett Eugene Grunz, June 18, 1914 – August 24, 1998) was an American actor, best known for his television roles as the lawyer Lawrence Preston on "The Defenders" in the 1960s and as neurosurgeon David Craig on "" in the 1970s.
 Among his film roles he is perhaps best known as the unflappable, conscientious "Juror #4" in Sidney Lumet's courtroom drama "12 Angry Men" (1957).
 He also played the President of the United States in "Superman II" (1980) and "" (2006).
The Morning After is a 1986 American mystery film directed by Sidney Lumet and starring Jane Fonda, Jeff Bridges and Raul Julia.
 Fonda was nominated for the Academy Award for Best Actress for her performance.

Question: Sidney Lumet was best known for?
Answer: director, producer and screenwriter