Mark Hulmes

Mark Hulmes is a founding member and the main Dungeon Master of the High Rollers D&D web series. They guest starred as Calianna Mordsson in and she guest DMed in.

Trivia

 * Mark played the Zemnian human fighter Walter Graf, one of the sons of Lord Zeddan Graf, in the Unwelcome Spirits adventure with D&D Beyond. The character, however, exists outside Critical Role canon.