Mark was appointed Chief Executive and Chief Nuclear Inspector of the United Kingdom’s Office for Nuclear Regulation (ONR) on 1 June 2021 having been ONR’s Chief Nuclear Inspector since 2017. He is an Executive Board member of the ONR and is the Regulatory Head of the organisation, providing independent, authoritative, expert advice on nuclear safety, security and safeguards to the ONR Board, Ministers and Parliament.

During the last 20 years he has successfully led ONR’s regulation across various sectors of the nuclear industry, securing improvements in safety and security performance. Mark has 35 years’ experience of the UK’s civil and defence nuclear industry, combined with extensive international experience, having undertaken various senior roles within the international regulatory community. He provides authoritative leadership and insight on nuclear safety and its regulation. Mark is a Chartered Fellow of the UK’s Nuclear Institute and has an honours degree in Mechanical Engineering.