A proud Armenian who claimed a distant link to nobility, born in what was then part of czarist Russia, Rouben Mamoulian (1897-1987) was one of the most astonishing and confounding figures in American film and theater, directing the original stage productions of Porgy and Bess, Carousel, and Oklahoma , as well as films including Love Me Tonight, Queen Christina, City Streets, and Silk Stockings. He was...