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. The current focus of my work is educational, entertainment and gaming applications of augmented and mixed reality environments, especially those that use personal displays (ie. ranging from see-through head-worn displays to video-mixed handheld displays) to directly augment a user's perception of their environment. 

My current projects focus on handheld AR games, distributed collaboration using mixed reality and virtual worlds, and mirror worlds as a platform for hybrid AR/VR experiences and applications.

I work with a broad range of technology as appropriate for the experience, including handheld, headworn, projection and auditory displays.  Beyond entertainment applications, I have worked on industrial applications of augmented reality with researchers in the GTRI Food Processing Technology Division.

In my research, I look at both task-focused and experiential systems, and blend elements of augmented and mixed-reality, ubiquitous computing, tangible media and wearable computing. My research addresses various computing issues (including human-computer interaction, computer graphics, computer systems, and software engineering) and design issues (including new media design theory, and tools and theories of design for new media) encountered during the design and implementation of augmented environments.

The activities of my research include both the exploration and design of prototype applications, as well as the design and implementation of interaction techniques and user-interface software architectures to enable their deployment.

I am involved with numerous conferences and workshops, and have been a Program Committee Chair for ISWC 2000 (International Symposium on Wearable Computing), ISMAR 2003 (International Symposium on Mixed and Augmented Reality), and UIST 2003 (The ACM Symposium on User-Interface Software and Technology). 

I am on the editorial boards of The International Journal of Human-Computer Studies and the journal Virtual Reality.  I have served as the guest editor (with Mark Livingston at NRL) of a "Mixed Reality" special issue of IEEE Computer Graphics and Applications.