I hate that a large percentage of my favorite books, the books that impacted me most when I was young and even since... were written by unrepentant bigots. (sigh) And before I go any further, I refuse to mention them or their books by name, mostly because I refuse to advertise for them. All of them (and there is more than one) wrote books that included themes of acceptance and tolerance only to find out the authors only wanted those things for bigoted people like them. I'm sure many can deduce who at least one of the authors I am referencing is, but she isn't the only one.
Ones I am happy to mention?
Anything and everything by Neil Gaiman. No caveats. He is awesome in everything he does. Read his books. Read them. Stop reading what I'm writing now, go get one of his books, read it, and then return to read the rest of my reply here. Now. Go. Do it.
Okay, now that you're back...
The works of Raymond E Feist are also wonderful. If you start with his first major work Magician (sometimes this book is split into Magician: Apprentice and Magician: Master), and then read each book that follows in order... it is an epic even larger than what Tolkien imagined, I kid you not. It starts with humble origins too, perhaps even more humble origins than Bilbo and Frodo, and escalates and escalates and escalates and escalates... and I don't want to even say how it escalates because I don't know how without giving away plot points! It's an amazing series. I highly recommend it to anyone that likes fantasy literature.
I love a lot of Anne McCaffrey's work, though I do find a few themes in a few books problematic. The "shellperson" series and "talent" series are hands down her best, imho, even though she's most famous for the Pern novels which I will also admit are what got me reading her work in the first place.
Finally? GRRM is good... but not great. I put McCaffrey above him, even though he's had more popular attention, the most of anyone I've listed here. There are quite a few of his philosophies on writing that I appreciate and hold dear... but I think the dude has a few fixations/obsessions about sex/violence that he might need to see a therapist about. Maybe that'll also get the last books in the series finished before he dies too, huh?