Ben Rosset is a game designer based out of Chicago who lived in DC for 13 years. His published titles include Mars Needs Mechanics, BrewCrafters and Between Two Cities.
Matt Grosso is the designer of Dead Last from Smirk & Dagger games and seems like a pretty nice guy.
Labyrinth Puzzles and Games is the heart of gaming in Washington, DC. Kathleen and her crew run one of the nicest game shops in the world and put in tons of effort to support gaming in the DC area. Stop by sometime!