Sad loss, but: I only ever read a few of his own stories, and not memorable. I grew up reading the first two dozen of his Year’s Best SF collections, and a few later; they were a good summary of what happened each year in short SF, then I’d follow up with the authors I liked from them. But I noticed by the ’00s that his editorial selections went from 75% white male US/UK writers doing Ben Bova-style SF to over 90%. The early volumes always had some Pat Cadigan, “James Tiptree, Jr”, Nancy Kress, and many more, and that faded out by the end; very few non-US/UK writers ever did make it in; I was going to say that no non-white writer ever made it in, but Octavia Butler is in #2 and #5, Steven Barnes in #34, and a few others, maybe 1% representation. I want more variety in “year’s best”.