Question: Delbert Mann and Stuart Heisler, have which mutual occupations?

Context paragraphs:
Stuart Heisler: Stuart Heisler (December 5, 1896 – August 21, 1979) was an American film and television director.  He was a son of Luther Albert Heisler (1855-1916), a carpenter, and Frances Baldwin Heisler (1857-1935).  He worked as a motion picture editor from 1921 to 1936, then dedicated the rest of his career to that of a film director.

Among the Living (1941 film): Among the Living is a 1941 film noir directed by Stuart Heisler, and starring Albert Dekker, Susan Hayward, Harry Carey and Frances Farmer.  The film is a mix of social drama, horror film, and suspense thriller.

Straight from the Shoulder (film): Straight from the Shoulder is a 1936 American drama film directed by Stuart Heisler and written by Lucian Cary and Madeleine Ruthven.  The film stars Ralph Bellamy, Katherine Locke, David Holt, Andy Clyde, Purnell Pratt and Onslow Stevens.  The film was released on August 28, 1936, by Paramount Pictures.

Journey into Light: Journey into Light is a 1951 American drama film directed by Stuart Heisler and starring Sterling Hayden.

Beachhead (film): Beachhead is a 1954 Technicolor war film based on Captain Richard G. Hubler USMCR's 1945 novel "I've Got Mine".  It was filmed in Kauai by Aubrey Schenck Productions, released through United Artists and directed by Stuart Heisler.

The Remarkable Andrew: The Remarkable Andrew is a 1942 film directed by Stuart Heisler and written by Dalton Trumbo, based on his 1941 novel of the same name.  It stars Brian Donlevy and William Holden.

Dallas (film): Dallas (1950) is an American Western Technicolor film directed by Stuart Heisler, and starring Gary Cooper, Ruth Roman, Barbara Payton, and Raymond Massey.  The film is set in the title city during the Reconstruction Era of the United States.

Delbert Mann: Delbert Martin Mann Jr. (January 30, 1920 – November 11, 2007) was an American television and film director.  He won the Academy Award for Best Director for the film "Marty" (1955), adapted from a 1953 teleplay of the same name which he had also directed.  From 1967 to 1971, he was president of the Directors Guild of America.  In 2002, he received the DGA's honorary life member award.  Mann was credited to have "helped bring TV techniques to the film world."

Storm Warning (1951 film): Storm Warning is a 1951 American film noir thriller, directed by Stuart Heisler, and featuring Ginger Rogers, Ronald Reagan, Doris Day and Steve Cochran.  Lauren Bacall was originally cast in the part eventually played by Rogers.  Bacall turned it down and was put on suspension by Warner Bros. for her defiance.

Tokyo Joe (film): Tokyo Joe is a 1949 American film noir crime film directed by Stuart Heisler from a story by Steve Fisher, adapted by Walter Doniger and starring Humphrey Bogart, Alexander Knox, Florence Marly, and Sessue Hayakawa.  This was Heisler's first of two features starring Bogart, the other was "Chain Lightning" that also wrapped in 1949 but was held up in release until 1950.

Supporting paragraphs: Delbert Mann Stuart Heisler
Answer: television and film director