Question: Emmett J. Flynn and Robert Rossen, have which mutual occupations?

Context paragraphs:
Emmett J. Conrad High School: Emmett J. Conrad, MD High School is a public high school located in Vickery Meadow, Dallas, Texas (USA).  Emmett J. Conrad High School, which covers grades 9-12, is a part of the Dallas Independent School District.  The school competes in UIL district 11-5A.  In 2015, the school was rated "Met Standard" by the Texas Education Agency.

Married Alive: Married Alive is a 1927 American silent comedy film directed by Emmett J. Flynn and written by Gertrude Orr.  The film stars Margaret Livingston, Matt Moore, Claire Adams, Gertrude Claire, Marcella Daly and Henry Sedley.  The film was released on July 17, 1927, by Fox Film Corporation.

Robert Rossen: Robert Rossen (March 16, 1908 – February 18, 1966) was an American screenwriter, film director, and producer whose film career spanned almost three decades.

In the Palace of the King: In the Palace of the King is a 1923 American silent historical romantic drama film based on the novel of the same name by F. Marion Crawford.  Directed by Emmett J. Flynn, the film stars Blanche Sweet, Pauline Starke, and Edmund Lowe.

Edge of Darkness (1943 film): Edge of Darkness (aka Norway in Revolt) is a 1943 World War II film directed by Lewis Milestone that features Errol Flynn, Ann Sheridan and Walter Huston.  The feature is based on a script written by Robert Rossen which was adapted from the 1942 novel "The Edge of Darkness" by William Woods.

Yellow Fingers: Yellow Fingers is a 1926 American silent drama film directed by Emmett J. Flynn and written by Eve Unsell.  The film stars Olive Borden, Ralph Ince, Claire Adams, Edward Peil, Sr., Otto Matieson and Nigel De Brulier.  The film was released on March 21, 1926, by Fox Film Corporation.

Emmett J. Flynn: Emmett J. Flynn (November 9, 1892 in Denver, Colorado – June 4, 1937 in Hollywood, California) was an American director, screenwriter, actor, and producer.

Monte Cristo (1922 film): Monte Cristo is a 1922 American silent film produced and distributed by Fox Film Corporation and directed by Emmett J. Flynn.  It is based on the novel "The Count of Monte Cristo" by Alexandre Dumas, which was adapted by 19th century thespian Charles Fechter and written for this screen version by Bernard McConville.  John Gilbert plays the hero with Estelle Taylor as the leading lady.  This film was long thought lost until a print surfaced in the Czech Republic.  The film has been released on DVD, packaged with Gilbert's 1926 MGM film "Bardelys the Magnificent".

The Hustler (film): The Hustler is a 1961 American drama film directed by Robert Rossen from Walter Tevis's 1959 novel of the same name, adapted for the screen by Rossen and Sidney Carroll.  It tells the story of small-time pool hustler "Fast Eddie" Felson and his desire to break into the "major league" of professional hustling and high-stakes wagering by high-rollers that follows it.  He throws his raw talent and ambition up against the best player in the country, seeking to best the legendary pool player "Minnesota Fats".  After initially losing to Fats and getting involved with unscrupulous manager Bert Gordon, Eddie returns to try again, but only after paying a terrible personal price.

East Lynne (1925 film): East Lynne is a 1925 American silent drama film directed by Emmett J. Flynn and starring Alma Rubens, Edmund Lowe, and Lou Tellegen.  The film is based on the bestselling 1861 Victorian novel of the same name by Ellen Wood.  The scenario was written by Lenore Coffee and the film's director, Emmett J. Flynn.

Supporting paragraphs: Emmett J. Flynn Robert Rossen
Answer: screenwriter, film director, and producer