Dr. Si received a Ph.D. in Computer Science from the University of Southern California and a M.A. in Psychology from the University of Cincinnati. Her primary research interest is virtual or mixed realities for games, training and health interventions. She is interested in using Artificial Intelligence technologies to make virtual environments more engaging and more effective. Dr. Si has more than five years of experience developing virtual environments and intelligent conversational agents for serious games. In particular, the Tactical Language Training System is a large-scale (six to twelve scenes each for three languages) award-winning project funded by US military for rapid language and culture training. The system has been used by thousands of military personnel. SAFE is a NIMH funded project for AIDS prevention. The final system is estimated to be used by more than two thousands users in clinical trials.