Professor Darby has worked within the Rolls-Royce Nuclear sector since joining Rolls-Royce and Associates Ltd. in 1977. Professor Darby has over 35 years’ experience of materials technology in pressurised water nuclear reactor systems (PWRs) including 14 years’ experience in management of technical professionals. He has had a leading role in high profile projects concerned with various aspects of PWR materials performance and structural integrity, including the design and assessment of in-reactor experiments to investigate complex materials behaviour, and the development of nuclear reactor component safety cases. He has held various management roles, with responsibility for professional metallurgists and chemists, and laboratory facilities. In 1999 Professor Darby was awarded one of the inaugural Rolls-Royce Engineering Fellowships in recognition of his contribution to PWR materials technology. He currently represents the UK on the ASTM Kroll Zirconium Medal Award Committee and the Jules Horowitz Reactor Fuels Working Group.