Jan Hayes is a sociologist with 35 years’ experience in safety and risk management. Her research interests are all connected to organizational accident prevention and include professional ethics, expertise, decision making and use of standards.Sarah Maslen is a sociologist working on expert decision making in critical contexts, with a particular focus on the cultivation of embodied and other tacit forms of knowledge. She is the author of Learning to Hear: The Auditory Bases of Excellence in Practicing Medicine, Climbing Mountains, Making Music, and Communicating in Morse Code (Columbia University Press).