Joseph J. LaViola Jr. is the Charles N. Millican Faculty Fellow and Associate professor in the Department of Electrical Engineering and Computer Science and directs the Interactive Systems and User Experience Research Cluster of Excellence at the University of Central Florida. He is the director of the modeling and simulation graduate program and is also an adjunct associate research professor in the Computer Science Department at Brown University. His primary research interests include pen-based interactive computing, 3D spatial interfaces, human-robot interaction, multimodal interaction, and user interface evaluation. Ernst Kruijff is a senior researcher at the Bonn-Rhein-Sieg University of applied sciences, where he heads the 3DMi group. The group focuses on the human-factors driven design of multisensory 3D user interfaces. Previously, Ernst worked at Graz University of Technology and Fraunhofer IMK, where he coordinated several large German and European research projects in the field of virtual and augmented reality. Ryan P. McMahan is an Assistant Professor of Computer Science and of Arts and Technology at UT Dallas. He directs the Future Immersive Virtual Environments (FIVE) Lab. His research focuses on using immersive VR technologies to promote learning and to provide training solutions that are better than real-world exercises. His other research interests include portable immersive technologies, multimodal sensory displays, natural 3D interaction techniques, and principles of human-computer interaction. Doug A. Bowman is Professor of Computer Science at Virginia Tech, where he directs the 3D Interaction Research Group and the Center for Human-Computer Interaction. He earned his M.S. and Ph.D. in Computer Science from Georgia Tech. His research interests include 3D user interfaces, 3D interaction techniques for virtual reality, the effects of fidelity in VR systems, and large high-resolution displays. He was awarded a National Science Foundation CAREER grant for his work on domain specific 3D user interfaces. Ivan Poupyrev is a Technical Program Lead working on advanced interaction research in the Advanced Technology and Products (ATAP) division at Google. He formerly worked at Disney Research Labs in Pittsburgh and the Sony Computer Science Labs in Japan. He spent two years at the Human Interface Technology Laboratory at the University of Washington as a Visiting Scientist designing and investigating 3D user interfaces. His current research interests are in designing and investigating advanced interfaces between humans and machines, including 3D interfaces, augmented reality interfaces, ubiquitous and wearable interfaces.