<u>Science Fiction:</u>
Anything by
Alastair Reynolds. Start with
Revelation Space. 'Space Opera' or 'Hard Sci-fi' is how you would describe his work. My favorite Sci-fi hands down, though I am open to recommendations in the genre. He also has lots of good short story collections.
<u>Fantasy:</u>
Robin Hobb's 3 related trilogies; The Farseer Trilogy, The Liveship Traders, and The Tawny Man.
All 9 books listed here.
While not as grand in scope as the G.R.R.Martin books, these are among my favorite fantasy reads ever, and as a bonus, they are COMPLETE.