Jack Sidnell is Associate Professor of Anthropology at the University of Toronto, Canada. He is the author of Talk and Practical Epistemology: The Social Life of Knowledge in a Caribbean Community (2005), the editor of Conversation Analysis: Comparative Perspectives (2009) and the author of Conversation Analysis: An Introduction (2009).  Tanya Stivers is Associate Professor of Sociology at the University of California, Los Angeles (UCLA). She is the author of Prescribing Under Pressure: Parent-Physician Conversations and Antibiotics (2007), and co-editor of Person Reference in Interaction: Linguistic, Cultural and Social Perspectives (with N. Enfield, 2007), and of The Morality of Knowledge in Conversation (with L. Mondada and J. Steensig, 2010).