Inaugural Fellow, Center on Global Energy Policy, Columbia University. Lead Author, Artificial Intelligence for Climate Change Mitigation Roadmap. Host, AI, Energy and Climate Podcast. Lead Author, Guide to Chinese Climate Policy. Chair, ICEF Innovation Roadmap Project. Visiting Professor, Schwarzman Scholars Program, Tsinghua University. Distinguished Research Fellow, Oxford Institute for Energy Studies. Board Member, Enagás, SA. Former senior official, White House, State Department, US Department of Energy.