Like
@Teresa Edgerton 's post, more than specific authors there are books that have really stayed with me. Sometimes if I read a lot more by the author then for some reason their style dominates over the magic of the original book or series that drew me in, and I can fall out of love with it. Also I find what I appreciate has changed a lot as I've got older.
So my young self adored Tolkien, Terry Brooks and David Eddings; then later Robert Jordan and Robin Hobb.
My older self would probably list China Mieville and Niel Gaiman as among my favourites, and I recently went back to Robin Hobb.
I haven't noticed anyone mention J V Jones - I remember loving the Sword of Shadows books, but I don't think I finished them because she was still writing them when I got sucked into academic reading.