I have been a faculty member in the Georgia Tech College of Computing and the GVU Center since January 1999, after finishing a PhD in the Department of Computer Science at Columbia University in New York City. I direct the Augmented Environments Lab, whose research focuses on the design and implementation of interactive mixed-reality and augmented-reality environments, as well as the tools to support people creating them. The current focus of my work is educational, entertainment and gaming applications of augmented and mixed reality environments. My current projects focus on handheld AR games, co-located social AR experiences, cognitive models of AR and space, AR and children, and AR software based on web technology. The latter interest is centered around our AR Web Browser, Argon.