After making his first screen appearance in 1920, Brook emerged as a leading British actor in the early 1920s. After moving to the United States, Brook became one of the major stars for Paramount Pictures in the late silent era. During 1928–29 he successfully made the transition to sound and continued to be featured in many of Hollywood's most prestigious films, including a number of literary adaptations. In the mid-1930s he returned to England, where he appeared regularly in leading film roles for a further decade.