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?

<P0-S0> 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. <P0-S1>  The film, which was written by Harry Behn and Howard Estabrook, was released by United Artists. <P0-S2>  Originally shot as a silent film, Hughes retooled "Hell's Angels" over a lengthy gestation period. <P0-S3>  Most of the film is in black-and-white, but there is one color sequence, the only color footage of Harlow's career. <SEP> <P1-S0> 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. <P1-S1>  The Oscar-winning script was written by Howard Estabrook based on the Edna Ferber novel "Cimarron". <P1-S2>  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. <P1-S3>  It is also one of the few Westerns to ever win the top honor at the Academy Awards. <P1-S4>  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. <SEP> <P2-S0> 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. <P2-S1>  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. <P2-S2>  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. <P2-S3>  His crowning achievement would be the Academy Award-winning 1931 film "Cimarron". <P2-S4>  Sarecky was the associate producer on the film, as well as helping adapt the screenplay, although he was uncredited for the latter. <P2-S5>  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). <SEP> <P3-S0> The Aesop's Fables are a series of animated short subjects, created by American cartoonist Paul Terry. <P3-S1>  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". <P3-S2>  Although Terry later claimed he had never heard of Aesop, he felt that Estabrook's idea was something worthwhile. <P3-S3>  Terry immediately began to set up a new studio called "Fables Studios, Inc." and received backing from the Keith-Albee Theatre circuit.