I can't believe this! I started watching a bunch of interviews with him yesterday (literally yesterday), and was wondering about writing him. I was motivated by his age and how I had missed the chance with Sagan and Gould (that last one really upset me).
In one of the interviews he said of all the things he wanted to be remembered for it was being a writer. My guess is that will be somewhat hard to forget.
h "Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing." - Robert E. Howard