Question: Who is most known for writing the screenplays for "L.A. Confidential", Kurt Gerron or Brian Helgeland?

Context articles: Kurt Gerron
The Three Wishes
L.A. Confidential (soundtrack)
Brian Helgeland
Jeannine Oppewall
The White Hell of Pitz Palu
L.A. Confidential
L.A. Confidential (film)
We Stick Together Through Thick and Thin
The White Demon

Kurt Gerron (11 May 1897 – 28 October 1944) was a German Jewish actor and film director.
The Three Wishes or De Drie Wensen is a 1937 Dutch film directed by Kurt Gerron.
 Simultaneously, an Italian language version, "I tre desideri", was filmed with Italian actors at Cinecitta' studios in Rome.
 Both movies were shot during the summer of 1937.
 The Dutch version was badly received and attendance was poor.
 The production suffered from delays and setbacks, forcing Dutch star Lien Deyers to resign.
 Her part was given to Annie van Duyn.
L.A. Confidential is either the original soundtrack, on the Restless Records label featuring mainly songs and source music, or the original film score, on Varèse Sarabande Records, of the 1997 Academy Award- and Golden Globe Award-winning film "L.A. Confidential" starring Kevin Spacey, Russell Crowe, Guy Pearce, James Cromwell, Danny DeVito, and Kim Basinger (who won the Academy Award for Best Supporting Actress for this film).
 The original score was composed by Jerry Goldsmith.
Brian Thomas Helgeland (born January 17, 1961) is an American screenwriter, film producer and director.
 He is most known for writing the screenplays for "L.A. Confidential" (for which he received the Academy Award for Best Adapted Screenplay), "Mystic River", and "".
 Helgeland also wrote and directed "42" (2013), a biopic of Jackie Robinson, and "Legend" (2015), about the rise and fall of the Kray twins.
Jeannine Claudia Oppewall (born November 28, 1946) is an American film art director.
 She has worked on more than 30 movies in such roles as production designer, set decorator and set designer, and has four Academy Award nominations for Best Art Direction for "L.A. Confidential", "Pleasantville", "Seabiscuit" and "The Good Shepherd".
 Many of her film sets represented different time periods within the 20th century, including the 1930s ("Seabiscuit)", the 1950s ("L.A. Confidential" and "Pleasantville)", and from the 1960s ("The Big Easy", "The Bridges of Madison County" and "Catch Me If You Can)."
The White Hell of Pitz Palu (German: "Die weisse Hölle vom Piz Palü" ) is a 1929 German silent mountain film co-directed by Arnold Fanck and Georg Wilhelm Pabst and starring Leni Riefenstahl, Gustav Diessl, Ernst Petersen, and World War I flying ace Ernst Udet.
 Written by Arnold Fanck and Ladislaus Vajda, the film is about a man who loses his wife in an avalanche while climbing the Piz Palü mountain, and spends the next few years searching the mountain alone for her body.
 Four years later he meets a young couple who agree to accompany him on his next climb.
 "The White Hell of Pitz Palu" was filmed on location in the Bernina Range in Graubünden, Switzerland.
 The 1929 theatrical release starred Kurt Gerron, who was Jewish, as a night club guest.
 The film was edited to remove scenes featuring Gerron, and it was rereleased as a 90-minute German-language sound film in 1935.
 It was remade in 1950.
L.A. Confidential (1990) is neo-noir novel by James Ellroy, and the third of his L.A. Quartet series.
 James Ellroy dedicated "L.A. Confidential" "to Mary Doherty Ellroy".
 The epigraph is "A glory that costs everything and means nothing—Steve Erickson."
L.A. Confidential is a 1997 American neo-noir crime film directed, produced and co-written by Curtis Hanson.
 The screenplay by Hanson and Brian Helgeland is loosely based on James Ellroy's 1990 novel of the same name, the third book in his L.A. Quartet series.
 Like the book, the film tells the story of a group of LAPD officers in 1953, and the intersection of police corruption and Hollywood celebrity.
 The title refers to the 1950s scandal magazine "Confidential", portrayed in the film as "Hush-Hush".
We Stick Together Through Thick and Thin (German: Wir halten fest und treu zusammen) is a 1929 German silent comedy film directed by Herbert Nossen and starring Sig Arno, Kurt Gerron and Ernst Karchow.
 It was one of two films starring Arno and Gerron in their characters of 'Beef' and 'Steak' in an effort to create a German equivalent to Laurel and Hardy.
The White Demon (German: Der weiße Dämon) is a 1932 German drama film directed by Kurt Gerron and starring Hans Albers, Gerda Maurus and Peter Lorre.
 The film is also known by the alternative title of Dope.
 The sets were designed by the art director Julius von Borsody.