An author (sometimes referred to as writer) is an individual who writes stories as seen in novels, holonovels and other mediums.
Benedict de Spinoza was a 17th century author who's work was discussed by James T. Kirk and Gary Mitchell. (TOS: "Where No Man Has Gone Before")
Tracy Tormé is the author of the Dixon Hill series who's work would also be adapted into various films and holonovels. (ENT: "Cogenitor"; TNG: "The Big Goodbye", "Manhunt", "The Emissary", "Clues"; Star Trek: First Contact; VOY: "Author, Author")
Langston Hughes, Richard Wright and Zora Neale Hurston were authors during the 20th century and was used as examples by Benny Russel of accepted Negro writers. (DS9: "Far Beyond the Stars")