Bryan Hannegan is Vice President of Environment and Renewables for the Electric Power Research Institute (EPRI). In this capacity, he leads the teams responsible for EPRI's research into technologies and practices that enable cleaner and more efficient renewable power generation, and reduce the environmental footprint associated with electric power generation, delivery and use. Prior to joining EPRI in September 2006, Hannegan served in a dual capacity as the Chief of Staff for the White House Council on Environmental Quality (CEQ), and as an acting Special Assistant to the President for Economic Policy. During his tenure, he led the development of the President's Advanced Energy Initiative and assisted Federal agencies in their implementation of the Energy Policy Act of 2005 (EPACT 2005). At CEQ, Hannegan also coordinated Federal agency policies and activities on a wide range of environmental issues affecting air, water, land, and ecosystems. Between 1999 and 2003, Hannegan served as Staff Scientist for the U.S. Senate Committee on Energy and Natural Resources, where he handled energy efficiency, renewable energy, alternative fuels, and environmental aspects of energy production and use. He put together the first draft of what would become EPACT 2005, and was a principal staff member for action on energy and climate legislation during the 107th Congress. He was appointed to serve on the CCST council in 2010.

A climate scientist, engineer and energy policy expert, Hannegan holds a doctorate in earth system science, a Master of Science in engineering, both from the University of California - Irvine, and a Bachelor of Science in meteorology from the University of Oklahoma.