The Wheel of Time series of books are very popular, but I never really got further into them past the first few chapters of the fourth book. I found the series to be largely a waste of trees, but there are lots of folks out there who really enjoyed his work. He was working on the twelfth, and supposedly, final novel in the series at the time of his death.
You can find more from his website here.
Rest in Peace, James Oliver Rigney, Jr.