John Sidney Blyth, known as John Barrymore and Jack Barrymore, was an American actor of stage, screen and radio. He first gained attention as a handsome stage actor in light comedy, then high drama and culminating in his portrayals in Shakespearean plays Hamlet and Richard III. His success continued with motion pictures in various genres in both the silent and sound eras. Barrymore's personal life has been the subject of much writing before and since his death in 1942. The most prominent member of a multi-generation theatrical dynasty, he was the brother of Lionel and Ethel, and was the paternal grandfather of actress Drew Barrymore.
Barrymore is known mostly for his portrayal of Hamlet and for his roles in movies like Dr Jekyll & Mr Hyde, Katharine Hepburn's first film A Bill of Divorcement, Grand Hotel, Dinner at Eight, Twentieth Century, Midnight and Don Juan, the first feature-length movie to use a Vitaphone soundtrack.