Duncan is a communication skills trainer and coach; delivering and designing leadership, management and effective communication courses, with a particular focus on practical activities, often using drama-based training to provide bespoke learning experiences. He regularly works with health care professionals across a wide range of backgrounds from NHS, Nuffield Health and Spire Healthcare. Some of the other organisations he has worked with recently include Microsoft, Morgan Sindell, National Lottery Heritage Fund, Local Space and Oxford University.

He regularly delivers 1:1 training sessions focusing on personalised communications skills training, interview technique and public speaking.