David engages across a range of energy system technologies to support ADB’s investments in the energy sector. Previously at the UN Economic Commission for Europe David's focus was on the role of fossil fuels in sustainable energy systems and at the International Energy Agency (IEA) was lead author for Energy Technology Perspectives publication. He also led the IEA’s work on electricity system technologies, such as Smart Grids. Over the course of his career David has worked in the energy and climate fields for over 20 years, with focus areas of technology, policy and analysis in both private and public sectors. In these roles he developed markets, deployed renewable and energy efficiency technologies and has advised various governments at the local and national levels on energy policy. Speaking at numerous events globally, he carries the message of appropriate technology use and deployment.