" In his best known story, Jim and Della sell their watch and hair to buy each other gifts pertaining to their watch and hair.
This author created shoemaker Ralph Spencer, who is actually safecracker Jimmy Valentine, in "A Retrieved Reformation." The title of one collection of his stories refers to the population of New York, The Four Million. In one of this author's stories, Bill Driscoll and Sam Howard end up giving 250 dollars to Ebenezer Dorset, whose son believes himself to be on a camping trip and styles himself "Red Chief." In his best known story, Jim and Della sell their watch and hair to buy each other gifts pertaining to their watch and hair. For 10 points, name this author of "The Gift of the Magi," known for his frequent twist endings.
This author created shoemaker Ralph Spencer, who is actually safecracker Jimmy Valentine, in "A Retrieved Reformation.
{O. Henry} [or {William Sidney Porter}; prompt on {Porter}]