Who is the Greatest Living Science Fiction Writer?

Vox Day emails:

After some extended discussion with both the VP readers and a group of
pro SF writers, the list of Greatest Living SF Writers was narrowed down
to 10. I thought perhaps you and your readers might be interested in
voting on the matter: poll here.
The poll will run all weekend and the winner announced on Monday.

Who would your choice be? Is he or she on the list?