The Health Systems team is an expanding, dynamic, inter-disciplinary group of researchers working across a broad range of health and social sciences disciplines. Our research approach is underpinned by rich contextual analysis, interdisciplinary approaches and co-design with healthcare professionals, patients and the public. Co-Lead is a 5-year programme that will research the impact of an emerging model of leadership (collective leadership) on team performance and on healthcare safety. We are designing and implementing collective leadership interventions for different team types and testing the impact of these interventions on staff performance and patient safety. The overall aim is to support quality and safety cultures through the development of a new model of leadership that is associated with effective team performance.