I am a social and cognitive psychologist whose work focuses on interpersonal communication in face-to-face and computer-mediated contexts. My research goals are to enhance our theoretical understanding of the mechanisms involved in conversational discourse and to apply this theory to the design and evaluation of new communications technologies such as video conferencing systems, gesture support tools, and tools for interacting with intelligent agents. I also study the development and use of shared mental models in work teams and the dynamics of large scale collaborations across multiple people, projects, and resources. I examine these issues within a variety of domains, including hospitals and corporations, using a combination of quantitative and qualitative research methods.