Pherus The Wizard

He knows the rules quite well even when there are changes and updates. He often asks you to describe what things look like giving you the opportunity to insert more flavor into your abilities and attacks.

I would say that Freja does the most work in her world-building than any GM I know, including online ones. She has written several sourcebooks for her setting and continues to add to them. She comes across to me as a writer at heart trying to weave epic narratives.