Hal Eden has been a research associate in the Department of Computer Science and the Center for LifeLong Learning and Design (L3D) at the University of Colorado Boulder. He has been associated with numerous research efforts over the past 30 years, including the design and development of technologies to support learning in the context of working, non-intrusive approaches to distance collaboration, and participatory design environments for face-to-face collaboration. As Associate Director of L3D, he has cultivated and supported a rich organizational, computational, and physical environment to support the L3D research community. Most recently, he has been studying the use of tangible interfaces in face-to-face collaborative settings to enhance social creativity, with specific emphasis on the assessment of interface usability and effectiveness.