Following a career in medical physics and radiation research, Jo joined HSE as a radiation specialist inspector, regulating the use of ionising radiations across medicine, research, education and industry and working on related strategy and policy. Jo moved to join the Nuclear Installations Inspectorate, leading teams to regulate nuclear decommissioning (including environmental impact assessment), conventional health and safety and nuclear safeguards, before joining HSE's Hazardous Installations Inspectorate, leading regulation of biological agents, explosives and chemical industries. She joined EA in 2015 and is now Deputy Director and Head of Radioactive Substances and Installations Regulation.