The authors of this excellent text define social epidemiology as the epidemiologic study of the social distribution and social determinants of states of health, implying that the aim is to identify socio-environmental exposures which may be related to a broad range of physical and mental health outcomes. In the first systematic account of this field, they focus on methodological approaches but draw widely from related disciplines such as sociology, psychology, physiology, and medicine in the effort to develop and evaluate testable hypotheses about the pathways between social conditions and health. The persistent patterns of social inequalities in health make this a timely publication.