Mark is Senior Vice President at the Environmental Defense Fund, a global environmental NGO with offices in China, India, Europe, and the United States, and presence in 30 countries, and an over 50-year history of delivering bold game-changing climate solutions to build a vital Earth for everyone. Mark is leader of the organization’s energy transition work, shaping strategies to accelerate decarbonization in major emitting sectors including energy and transportation, in line with a net zero future. He is an authoritative voice on critical energy policy issues, such as the future role hydrogen in a clean energy economy. He is widely acknowledged to be a global expert on the issue of methane pollution and is actively involved in several cutting-edge initiatives to measure, monitor, and reduce this waste, including MethaneSAT, a subsidiary of Environmental Defense Fund that will soon be the most advanced methane-tracking satellite in space, capable of measuring and reporting on methane emissions virtually anywhere on earth.