I never met William Sanders, but I admired his work, and after I began studying mobbing and call-out culture, I admired the man, too. I wrote about him in The Powwow Dancer vs. the People of Privilege - Mobbing William Sanders.
The story of his that is most likely to be remembered is online: "The Undiscovered" by William Sanders (pdf).
He retired from writing, then wrote a couple of stories. I'll always wonder what more he might've written if fandom's identitarians had not decided to drive him from the field.
ETA: I learned of this from Gardner Dozois's Facebook post.