William Mezzullo is Head of Hydrogen at Centrica Energy Markets & Trading, and Chair of the Renewable Energy Association’s Green Gas & Hydrogen Forum. William is responsible for commercialising hydrogen development opportunities for Centrica. Prior to joining Centrica, he was a Fund Lead at JLEN, a FTSE 250 environmental fund. William has worked in the renewable energy industry since 2010, developing and building commercial-scale green gas anaerobic digestion plants, where he was Head of Projects at Future Biogas, one of the largest anaerobic digestion companies in the UK.  He holds a PhD from the University of Bath in bioenergy.