Mr Chan has provided expert medico-legal opinion, predominantly in breast-related matters, since 2005. His extensive experience includes medical negligence and regulatory (GMC) cases, with regular instructions from NHS Resolution, NHS Wales, HSCNI, MPS, MDU, and MDDUS, as well as numerous claimant solicitors.

He acted as an expert surgical witness in the 2017 Ian Paterson Class Action, which was settled out of court for £37.3 million, and was subsequently invited to serve as a professional adviser to the Bishop of Norwich for the Paterson Inquiry.