Question: What occupation did Cornel Wilde have in common with John M. Stahl?

Context articles: Cornel Wilde
The Scarlet Coat
Shockproof
Leave Her to Heaven
The Naked Prey
The Walls of Jericho (film)
No Blade of Grass (film)
Sharks' Treasure
Lancelot and Guinevere
Maracaibo (film)

Cornel Wilde (October 13, 1912 – October 16, 1989) was a Hungarian-American actor and film director.
The Scarlet Coat is a 1955 American historical drama and swashbuckler in Eastmancolor and CinemaScope from MGM, produced by Nicholas Nayfack, directed by John Sturges, that stars Cornel Wilde, Michael Wilding, George Sanders, and Anne Francis.
 The film is based upon the events in the American Revolution in which Benedict Arnold offered to surrender the fort at West Point to the British in exchange for money.
Shockproof is a 1949 American film noir directed by Douglas Sirk and starring Cornel Wilde and Patricia Knight.
 Wilde and Knight were husband and wife during filming.
 They divorced in 1951.
Leave Her to Heaven is a 1945 American Technicolor film noir starring Gene Tierney, Cornel Wilde, Jeanne Crain, with Vincent Price, Darryl Hickman, Ray Collins, and Chill Wills.
 The story was adapted for the screen by Jo Swerling from the best selling novel of the same name by Ben Ames Williams and directed by John M. Stahl.
The Naked Prey is a 1965 adventure film starring Cornel Wilde, who also served as director and producer, which was released by Paramount Pictures.
 Set in the South African veldt, the film is a wilderness survival story loosely based on the experiences of explorer John Colter, who was pursued by Blackfoot warriors through frontier Wyoming in 1809.
 The screenplay earned Clint Johnson and Don Peters an Academy Award nomination.
The Walls of Jericho is a 1948 American drama film directed by John M. Stahl and written by Lamar Trotti.
 The film stars Cornel Wilde, Linda Darnell, Anne Baxter, Kirk Douglas, Ann Dvorak, Colleen Townsend and Marjorie Rambeau.
 The film was released by 20th Century Fox on August 4, 1948.
No Blade of Grass is a 1970 British-American apocalyptic science fiction film directed by Cornel Wilde and starring Nigel Davenport, Jean Wallace, and John Hamill.
 It is an adaptation of John Christopher's novel "The Death of Grass" (1956) and follows the survivors of a plague that has hit London in the not too distant future.
 When London is overwhelmed by food riots caused by a global famine, a man tries to lead his family to safety in Westmorland.
Sharks' Treasure is a 1975 American adventure film written, produced and directed by Cornel Wilde and starring Cornel Wilde and Yaphet Kotto.
Lancelot and Guinevere (known as Sword of Lancelot in the U.S.) is a British 1963 film starring Cornel Wilde, his real-life wife at the time, Jean Wallace, and Brian Aherne.
 This lesser-known version of the Camelot legend is a work shaped predominantly by Cornel Wilde, who co-produced, directed, co-wrote, and played Lancelot.
Maracaibo is a 1958 American drama film directed by Cornel Wilde and written by Ted Sherdeman.
 The film stars Cornel Wilde, Jean Wallace, Abbe Lane, Francis Lederer, Michael Landon and Joe E. Ross.
 The film was released on May 21, 1958, by Paramount Pictures.