Brennan Lee MulliganBrennan Lee Mulligan.

Brennan Lee Mulligan (born January 4, 1988) is an American comedian, actor, writer, and gamemaster. He often works with Dropout (formerly CollegeHumor) as a writer, performer, and producer. He is the creator and regular gamemaster for Dropout's actual play series Dimension 20 as well as the dungeon master for the first campaign of the creator-owned actual play podcast Worlds Beyond Number and the fourth campaign of the actual play web series Critical Role.