In 1971 he started a publishing imprint called Guidon Games which produced rulebooks for miniature wargaming and board wargames, and he tapped Gary Gygax to serve as editor. Lowry designed two of the games, Ironclad and Atlanta, himself and provided the illustrations for some of the other games.
In 1971, Lowry started Guidon Games, a publishing house focused on rulebooks for miniature wargames and board games. He hired Gary Gygax as editor and designed two games himself: Ironclad and Atlanta.  Lowry also illustrated some of the other games.