I’m also a long-time sci-fi and fantasy geek (and I’m stepping out as a sci-fi and fantasy author, too), and I think your list is fantastic, except for one thing: you’re missing Lois McMaster Bujold. Her Vorkosigan saga is (and has been for some time) my favorite sci-fi series; the plots are engaging and twisty, her characters have depth, and are both lovable and flawed, and her setting has a wonderful clash of traditions and worldviews, one of the best, most interesting and believable universes I’ve ever encountered. And considering the huge volume of books I’ve read over the decades, that’s really saying something.
I’d suggest you read her books in story chronology (which is not quite the same as publishing chronology), and start with the novellas “Shards of Honor” and “Barrayar”, which you can often find collected into an omnibus called “Cordelia’s Honor”.
She’s also written several fantasy series, which are also good and worth reading, but I think her Vorkosigan saga is definitely her masterpiece.
Oh, and if you still don’t believe me that Bujold is worth reading — she’s a multiple Hugo winner, too.