Question: who directed the film which Oscar-winning script was written by Howard Estabrook, who's associate film producer helping adapt the screenplay, although he was uncredited for the latter?

Context articles: Cimarron (1931 film)
The Price of a Party
The Human Comedy (film)
Hell's Angels (film)
Aesop's Fables (film series)
The Bridge of San Luis Rey (1944 film)
Howard Estabrook
Varsity (film)
The Devil's in Love
Louis Sarecky

Cimarron is a 1931 Pre-Code Western film directed by Wesley Ruggles, starring Richard Dix and Irene Dunne, and featuring Estelle Taylor and Roscoe Ates.
 The Oscar-winning script was written by Howard Estabrook based on the Edna Ferber novel "Cimarron".
 It would be RKO's most expensive production up to that date, and its winning of the top Oscar for Best Production would be only one of two ever won by that studio.
 It is also one of the few Westerns to ever win the top honor at the Academy Awards.
 Epic in scope, spanning forty years from 1889 to 1929, it was a critical success, although it did not recoup its production costs during its initial run in 1931.
The Price of a Party is a 1924 American silent melodrama film produced by Howard Estabrook and distributed by Associated Exhibitors.
 The film is based on a short story of the same name by William Briggs MacHarg with the film's scenario written by Charles F. Roebuck.
 It was directed by Charles Giblyn and stars Hope Hampton and Harrison Ford.
The Human Comedy is a 1943 American drama film directed by Clarence Brown and adapted by Howard Estabrook.
 It is often thought to be based on the William Saroyan novel of the same name, but Saroyan actually wrote the screenplay first, was fired from the movie project, and quickly wrote the novel and published it just before the film was released.
 The picture stars Mickey Rooney with Frank Morgan.
 Also appearing in the film are James Craig, Marsha Hunt, Fay Bainter, Ray Collins, Van Johnson, Donna Reed and Jackie 'Butch' Jenkins.
 Robert Mitchum (as "Quentin") and Don DeFore appear together as boisterous soldiers in uncredited supporting roles.
Hell's Angels is a 1930 independently made American epic aviation war film, directed and produced by Howard Hughes, that stars Ben Lyon, James Hall, and Jean Harlow.
 The film, which was written by Harry Behn and Howard Estabrook, was released by United Artists.
 Originally shot as a silent film, Hughes retooled "Hell's Angels" over a lengthy gestation period.
 Most of the film is in black-and-white, but there is one color sequence, the only color footage of Harlow's career.
The Aesop's Fables are a series of animated short subjects, created by American cartoonist Paul Terry.
 Terry came upon the inspiration for the series by young actor-turned-writer Howard Estabrook, who suggested making a series of cartoons based on "Aesop's Fables".
 Although Terry later claimed he had never heard of Aesop, he felt that Estabrook's idea was something worthwhile.
 Terry immediately began to set up a new studio called "Fables Studios, Inc." and received backing from the Keith-Albee Theatre circuit.
The Bridge of San Luis Rey is a 1944 drama film made by Benedict Bogeaus Productions and released by United Artists.
 It was produced and directed by Rowland V. Lee with Benedict Bogeaus as co-producer.
 The screenplay by Howard Estabrook and Herman Weissman was adapted from the novel "The Bridge of San Luis Rey" by Thornton Wilder.
 The music score was by Dimitri Tiomkin and the cinematography by John W. Boyle and an uncredited John J. Mescall.
Howard Estabrook (born Howard Bolles, July 11, 1884 – July 16, 1978) was an American actor, film director and producer, and screenwriter.
Varsity is a lost 1928 American comedy silent film directed by Frank Tuttle and written by Howard Estabrook, George Marion Jr. and Wells Root.
 The film stars Charles 'Buddy' Rogers, Mary Brian, Chester Conklin, Phillips Holmes, Robert Ellis and John Westwood.
 The film was released on October 27, 1928, by Paramount Pictures.
The Devil's in Love (also known as Consul of the Damned) is a 1933 American drama film directed by William Dieterle and written by Howard Estabrook.
 The film stars Victor Jory, Loretta Young, Vivienne Osborne, David Manners, C. Henry Gordon and Herbert Mundin.
 The film was released on July 21, 1933, by Fox Film Corporation.
Louis Sarecky (January 26, 1886 – March 4, 1946) was an American film producer and screenwriter at the very beginning of the sound era of motion pictures.
 Born in 1886 in Odessa in what was then the Russian Empire (today now part of Ukraine), he began his career in the last year of silent film, 1928, working on five films that year, four as screenwriter and one as producer.
 While he is only credited with working on 26 films, some of those were among the most popular films at that time: "The Vagabond Lover" (1929), Rudy Vallée's screen debut; "The Cuckoos", starring the comedy team of Wheeler & Woolsey; and "Friends and Lovers" in 1931, starring Adolphe Menjou and Laurence Olivier.
 His crowning achievement would be the Academy Award-winning 1931 film "Cimarron".
 Sarecky was the associate producer on the film, as well as helping adapt the screenplay, although he was uncredited for the latter.
 Since the film won the Oscar for both outstanding production and best adapted screenplay, he would have the dubious distinction of contributing in both those fields, yet not receiving an Academy Award himself (William LeBaron would receive the Outstanding Production Oscar, while Howard Estabrook would get the writing statue).