Sir Stephen Hillier is the Chair of the UK Civil Aviation Authority (CAA) and a retired Air Chief Marshal who previously served as Chief of the Air Staff of the Royal Air Force from 2016 to 2019. With a distinguished military career spanning over four decades, Sir Stephen has extensive experience in leadership, operations, and strategic planning. During his RAF service, he played a key role in shaping the future capabilities and infrastructure of the UK’s air defense and contributed significantly to defense policy. Since joining the CAA, Sir Stephen has focused on enhancing aviation safety, security, and sustainability. His dedication to public service continues to impact both national defense and civil aviation in the UK.