David Overton possesses expertise in earth science, upstream, program management, oil/gas, stakeholder management and 22 more skills. Colleagues describe him as "David's skilful management of the TEMPO programme was key to its success. The programme covered a diverse series of dependent activities over a long period, which he successfully kept in step and delivering on time and budget. Potentially distracting external pressures were numerous, and David deftly discarded those that were irrelevant, whilst allowing pertinent changes to be accepted into the programme workflow. His focus on delivery, stakeholder management, and realisation of bottom line benefits (not just esoteric targets) ensured the global success of the programme as a whole. I would unreservedly recommend David as an asset to any programme."