Guy is a Senior Research Associate at Sightline Climate, where he leads Sightline's work on clean firm power, including fusion energy, nuclear fission, and next gen geothermal. Guy's research focuses on the commercialization of novel technologies to inform investment and strategic decision making. Prior to joining Sightline Guy was Head of Policy at Privitar, a fellow at Cambridge University's Centre for Science and Policy, and on the UK Government Civil Service Fast Stream. Guy holds a Bsc in Physics and Philosophy from the University of Bristol.