Hollywood in the years between 1929 and 1948 was a town of moviemaking empires. The great studios were estates of talent: sprawling, dense, diverse. It was the Golden Age of the Movies, and each studio made its distinctive contribution. But how did the studios, “growing up” in the same time and place, develop so differently? What combinations of talents and temperaments gave them their signature styles? These are the questions Ethan Mordden answers,...