Greg was first introduced in the Duel Hero: DASH - Volume 1 series of the Duel Masters Manga.


He is shown as the boss of DASH organization and the leader of Duel Hero Yuu and Duel Hero Atsuto. He is the one who gave both Yuu and Atsuto their decks when he sends them out to either help children, or to take down bullies.

He also organizes for both of them for when they host any tournament or TV show.


  • In Real Life, Greg is named after Greg Leeds, the CEO of Wizards of the Coast, the company that prints Duel Masters cards.
  • He was printed on the card DASH Leader Greg released in DMX-12 Black Box Pack.