I use artificial intelligence to improve the game-design process, mainly at the prototyping stage.
The overall vision is a "CAD for game design": an environment that helps a game designer prototype their game, while also providing useful feedback, automation, and visualization where desirable. In order to make that possible, a large portion of my work is on formal representations of videogame mechanics, and on ways humans who aren't logic specialists can write and edit those representations.
I've also done a good bit of work on interactive narrative, particularly on ways to help authors write complex, branching narratives without having to manually specify every possible combination. Other perennial interests include computer music, generative/algorithmic art more generally, and statistical machine learning.
In my spare time, I'm a Wikipedia administrator (since 2003). It's partly a hobby I participate in for its own interest (and because I support the goals of the project). But I also think it's quite relevant to my day job as an academic: since it's now a place where a large number of people get their information on a regular basis, I think it's useful for academics to participate in, understand, and be engaged in its community.
I haven't yet moved over my publications from my old Georgia Tech page, so please check there for now!
I also sometimes write some less formal essays on academic subjects.