David Millen is a senior researcher at IBM Research and the Center for Social Software in Cambridge, Massachusetts. In his research he designs and builds new social software services, and explores the social, business, and technological implications of these new tools through large-scale field studies of use. Important projects include the Dogear Social Bookmarking System and Beehive Social Networking Service, which were both pioneering examples of social software designed for enterprise settings. He has completed empirical studies of incentive and reward systems in social applications, and examined novel approaches to social recommenders and social search. David also studies how social applications accelerate the awareness of cultural differences and how we can design novel systems to better support intercultural collaboration. Recently, he has been working on a project to integrate social business into the public sector in a citizen engagement project. Prior to joining IBM, David worked at AT&T Research and Bell Laboratories, where he explored how new technologies changed employee work activities, organizational roles, and patterns of communication. He also directed a User Interface Design Group, which was responsible for the user interface design of advanced business communications systems as well as conducting exploratory prototype development of advanced speech applications and pen-based interfaces. David has been an adjunct faculty member at Rutgers University (NJ) and at Tufts University (MA), where he recently taught a class on The Social Web. David holds a BA from Columbia University, an MS in Management from Purdue University and a PhD. in Cognitive Science/Psychology from Rutgers University. In 2011, David was recognized by ACM as a Distinguished Scientist for his work in the area of social computing.