Roger L Kneebone is professor of surgical education and engagement science at Imperial College London. He is a clinician and educationalist whose multidisciplinary research builds on his personal experience as a surgeon and a general practitioner and his fascination with what it means to become expert. He collaborates with scientists, craftspeople, artists and performers, and leads the Imperial/Royal College of Music Centre for Performance Science. He is the author of Expert: Understanding the Path to Mastery (Penguin, 2020).