Just in case it gets updated some day:
Anne McCaffrey, Dragonriders of Pern Series, 1968, scifi. Because dragons are COOL - and because she inspired my lifelong love of science fiction and fantasy with these books.
Neil Gaiman, American Gods, 2001. fantasy. Fantastic world building and mythology.
Robin Hobb, Farseer books, 1995, fantasy. Great worldbuilding, characters with fascinating lives.
Margaret Atwood, A Handmaid's Tale. 1985. dystopian fiction. Because 30 years since I've read this, it still occasionally gives me disturbing dreams.
Mercedes Lackey, Valdemar series, fantasy, worldbuilding, fantastic characters, and complex politics.
Robert Heinlein, The Moon is a Harsh Mistress, 1966, scifi. Incredible characters, complex interactions, great vision of current situations.
JRR Tolkien, LOTR, of course.
GRR Martin, Game of Thrones series. fantasy - complex politics, groundbreaking in it's grittiness, not afraid to kill off EVERYONE.
Brave New World, Aldous Huxley, 1932. dystopian fiction. Another that gives me disturbing dreams at night, 35 years after reading it the first time.
Marion Zimmer Bradley, Mists of Avalon, 1982, historical fantasy. Epic, from the female and pagan POV rather than the normal male/Christian POV.
Diana Gabaldon, Outlander, 1991, historical fantasy. Epic, interstitial, grand adventure with very real characters.
Piers Anthony, Incarnations of Immortality series, 1983, urban fantasy. Great concept of humans taking on immortal jobs. Great world-building.