Jack A. Clark, PhD. I practice medical sociology in health services and policy research. My interests focus on how people, as members of society, look after their health and the health of others, including their actions as users and providers of health care. Fundamental to my work are ideas that health, health problems, remedial actions, service organizations, and related social institutions are constituted in social relations; they reflect habits, knowledge, and capabilities people have as members of society, such as their uses of language. They also reflect their authority and power as individuals and as members of social groups. Health services, both formal and informal, are patterns of these social relations. I have conducted research in how people live with chronic diseases, turn to formal and informal health services, communicate with providers of care or services, reach treatment decisions, and live with the outcomes of health care. I have worked closely with medical researchers in articulating sociological frames for diverse studies of clinical practices: patient-centered communication, treatment of early prostate cancer and its outcomes, patients’ adherence and perseverance in antiviral treatment for hepatitis C, practices of patient navigators in cancer care, negotiations between clinicians and parents regarding HPV vaccination of children, management of incidentally discovered pulmonary nodules, and the selection of candidates for liver transplantation. In many studies I have mentored faculty and students in their research. My research typically seeks to integrate quantitative and qualitative methods, albeit from a perspective strongly informed by ethnography and related methods for the analysis of social interaction, discourse, and narrative. Much of my career was spent in health services research and development in the Department of Veterans Affairs, serving as a member of the faculty of the HSR&D program at the Edith Nourse Rogers Memorial Veterans Hospital in Bedford, MA, from the program’s founding in 1990 until my retirement from the VA in 2018.