What happens, and at the expense of what else? Actions have consequences, and some hinge on the fact that when one thing happens, other things that could have happened at the same time do not. This is true and important at many levels of analysis, including in face-to-face interaction, where simultaneity limitations are especially obvious. I’ve explored the implications of this through research on the way in which network relations (like friendship) affect conversational turn-taking; research on the consequences of interruption in adversarial interactional settings; research on the effects of conversational exclusion on discursive options (in group discussions); research on the way in which scheduling decisions mediate between networks and diffusion; and research on media coverage and non-coverage of different sorts of news (e.g., foreign, national). My other interests include theory, micro-spatial dynamics, sequence analysis, and the logic of social research.