Answer:David O. Selznick and Louis B. Mayer
David O. Selznick, son of silent-movie producer Lewis Selznick, was already on his way through the ranks of new-to-talkies Hollywood when, in 1930, he forged the greatest union of Hollywood families in history by marrying Louis B. Mayer’s daughter Irene. Selznick had left MGM for Paramount and then RKO when he returned to work with his father-in-law at MGM in 1933, given a job as vice president and head of his own production unit at the studio. By then, Mayer was one of the most powerful studio heads in Hollywood, overseeing “more stars than there are in heaven.” In 1927, Mayer amassed 36 founders from various parts of the film industry to create the Academy of Motion Picture Arts and Sciences—the organization responsible for the Academy Awards. The guidance of his father-in-law at MGM paid off for Selznick when he left in 1935 to head up his own independent studio, Selznick International Pictures, which produced the likes of A Star Is Born (1937), Rebecca (1940), and (adjusted for inflation) the highest-grossing film of all time, Gone with the Wind (1939). His son Daniel Selznick became a film producer as well.
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