Through this editorial we introduce the fourth 'theory special issue' of Health, Risk and Society. The aim of the series, published more or less annually since 2014, is to provide a platform for theoretical development around core and emerging topics within social scientific studies of risk and uncertainty. By including original research articles alongside other formats, such as guest editorials or review articles, the previous special issues have sought to stimulate theorising, and reflection on theorising, through different ways of connecting theory to the empirical. We have sought to do something similar in this current special issue. By way of introduction to the special issue, we will first set out our conceptualisation of risk work and what this means for the foci of the articles included. We then proceed to set out some key intersections between the sociology of risk and uncertainty and the sociology of professions and professional work. These are pertinent for furthering understandings of risk work but also in understanding how studies of risk work can contribute to these wider fields, as is apparent from the studies within the issue. We will then briefly introduce these different studies, relating them to each other in terms of some common emerging themes, before concluding with some future theoretical and methodological directions, concerns and challenges. Risk work in client-facing contextsdelineating the focus of this issue The contributors to the previous theory special issue (volume 18: 7-8) addressed the topic of 'dealing with uncertainty and risk in everyday practice'. The starting point of that collection was Zinn's (2008) consideration of different ways of handling uncertainty (e.g.risk, trust, hope, intuition) and various ways in which these approaches are combined or 'bricolaged' (Horlick-Jones, Walls, & Kitzinger, 2007) in everyday practices. There is therefore a strong connection between that issue and this current collection in that in our writing to date on 'risk work', which we have used to frame the special issue, we have been influenced by Zinn's work alongside Horlick-Jones's (2005) use of 'risk work' to emphasise the pragmatic, situated manner by which risk and uncertainty are negotiated or handled in everyday working contextsthat is how this work 'gets done' (see Brown & Gale, 2018; Gale, Thomas, Thwaites, Greenfield, & Brown, 2016). But whereas Horlick-Jones (2005) and another recent book on risk work (Power, 2016) consider these practices chiefly in terms of organisational power structures and agendas within these, our emphasis is far more on the workers themselvestheir lived, embodied experiences and occupational identities, and how these relate to everyday practiceswhile still locating these within wider organisational and (para)professional power dynamics (Brown & Gale, 2018). One further distinction (cf. Power, 2016) is that we are interested in clientfacing, 1 front-line (Harrits & Møller, 2014) or street-level (Gale, Dowswell, Greenfield, & Marshall, 2017, Lipsky, 1980) work ...