In 1925, Hathaway began working in silent films as an assistant to notable Directors such as Victor Fleming and Josef von Sternberg and made the transition to sound with them. He was the assistant Director to Fred Niblo in the 1925 version of Ben-Hur starring Francis X. Bushman and Ramon Novarro. During the remainder of the 1920s, Hathaway learned his craft as an assistant, helping direct Future stars such as Gary Cooper, Marlene Dietrich, Adolphe Menjou, Fay Wray, Walter Huston, Clara Bow, and Noah Beery.