Matt Mercer, Deborah Ann Woll, other professional DMs helped write the new Dungeon Master's Guide
Briefly

We repeat that approach at the beginning of the Dungeon Master's Guide while pulling the camera a little bit more into the Dungeon Master's head. We cover just the very basics of: What is the DM's job? What do you need to do to get started? How do you find players to play with? What do you do to prepare a session?
We also really want to encourage DMs to learn from others, but not feel they have to imitate others. Because every Dungeon Master is unique. Everyone has their own style.
Read at Polygon
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