William DeWolf Hopper Jr. (January 26, 1915 – March 6, 1970) was an American stage, film, and television actor. The only child of actor DeWolf Hopper and actress and Hollywood columnist Hedda Hopper, he appeared in more than 80 feature films in the 1930s and 1940s. After serving in the United States Navy during World War II, he left acting, but was persuaded by director William Wellman in the 1950s to resume his film career. He’s perhaps best known for his portrayal of private detective Paul Drake in the CBS television series Perry Mason.

Hopper began his acting career as a teenager. He made his first stage appearance at the Pasadena Community Playhouse, in She Loves Me Not. He worked in summer stock in Ogunquit, Maine. He appeared on Broadway in Order Please (1934) and as a member of the ensemble in Katharine Cornell’s production of Romeo and Juliet (1934–35).

In 1936, Hopper won a contract at Paramount Pictures. He was credited in movies as Wolfe Hopper and DeWolf Hopper. In 1936, he appeared in The King Steps Out, and in 1937 he was in Public Wedding, Over the Goal, The Footloose Heiress and in 1938, Mystery House.

Hopper’s film roles included Stagecoach (1939), The Return of Dr. X (1939), Over the Goal (1939), Knute Rockne, All American (1940), The Maltese Falcon (1941) and Yankee Doodle Dandy (1942).

Hopper became an actor because his mother expected it of him.  “When I worked at Warner Bros.,” Hopper said, “I was so scared I stuttered all the time.”