David W. McDonald is Professor and Chair of the Department of Human Centered Design & Engineering (HCDE) in the College of Engineering at University of Washington. Dr. McDonald has ongoing projects studying collaboration in Wikipedia, social matching, fostering healthy behavior all through systems that interleave computation with human activity. He has published research on ubiquitous sensing for behavior change, collaboration in distributed contributor systems, collaborative authoring, recommendation systems, and public use of large screen displays. His general research interests span Computer-Supported Cooperative Work (CSCW) and Human-Computer Interaction (HCI).