Features was established, Harry acquired an office in New York with his brother Albert, sending Sam and Jack to run the new corporation's film exchange divisions in San Francisco and Los Angeles. In 1917, Harry won more capital for the studio when he was able to negotiate a deal with Ambassador James W. Gerard to make Gerard's book My Four Years In Germany into a film. In 1918, after the success of My Four Years In Germany, the brothers were able to establish a studio near Hollywood, California. In the new Hollywood studio, Sam became co-head of production along with his younger brother, Jack. They were convinced that they would have to make movies themselves if they were to ever generate a profit. Between the years 1919 and 1920, the studio did not turn a profit. During this time, banker Motley Flint, who was, unlike most bankers at the time, not anti-semitic, helped the brothers pay off their debts. The four brothers then decided to relocate their studio from Culver City, California to the Sunset Boulevard section of Hollywood. During this time, Warner decided to focus on making only dramas for the studio. The studio rebounded in 1921 with the success of the studio's film Why Girls Leave Home; The film's director, Harry Rapf, became the studio's new head producer. On April 4, 1923, following the success of the studio's film The Gold Diggers, Warner Bros. Pictures, Inc. was officially established, with help from a loan given to Harry by Montly Flint. Harry became company president, with Albert as treasurer and Jack and Sam as co-heads of production. Harry and his family moved to Hollywood. Warner Bros. Pictures, Inc. The studio discovered a trained German Shepherd named Rin Tin Tin in 1923. The canine made his starring debut in Where the North Begins, a film about an abandoned pup who is raised by wolves and befriends a fur trapper. According to one biographer, Jack Warner's initial doubts about the project were quelled when he met Rin Tin Tin, "who seemed to display more intelligence than some of the Warner comics." The trained dog proved to be the studio's most important commercial asset until the introduction of sound. Prolific screenwriter Darryl F. Zanuck produced several scripts for Rin Tin Tin vehicles and, during one year, wrote more than half of the studio's features. Between 1928 and 1933, Zanuck served as the