Duncan is a pre-eminent commercial Silk, widely regarded as one of the leading advocates at the Bar for the conduct of the largest and most complex domestic and international disputes. A former Head of Chambers (2014–2022), he is consistently instructed on matters of the highest value and strategic importance, including bet-the-company litigation and international arbitration, multi-jurisdictional fraud and high-stakes disputes. Duncan is particularly sought after for his ability to take command of the most complex disputes, to integrate seamlessly into large multi-disciplinary legal teams, and to lead substantial groups of senior and junior counsel across jurisdictions. He is widely recognised for his strategic judgment, meticulous preparation and authority in court.