I am a sociologist and network scientist. My primary research agenda employs network science to study identity structures, the set of roles, memberships, and other ways of defining oneself (e.g., mother, father, volunteer, environmentalist). I map and characterize identity structures, explore how different countries and demographic subpopulations present distinct structures, and investigate the consequences of given arrangements for health and well-being. I also use network science to study a broad range of topics, including collaboration networks, text networks, social-ecological systems, personal networks and health, and mental models of beliefs. I am a Visiting Research Fellow at Duke Network Analysis Center and an independent research consultant.