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I have worked as an energy and environmental systems analyst since the early 1980s—from local to global scales. My specialties are energy efficiency in buildings and industry and the intersection of energy technology, global climate change impacts, and risk management. I am currently with the U.S. Department of Energy's Lawrence Berkeley National Laboratory (LBNL), a world-class research center on energy and environment with a staff approximately 400 people.  My closest mentor and collaborator at LBNL was Art Rosenfeld, for whom I served as his Deputy Director of his Center for Building Science, later leading the Center. I also consult widely for private industry and the public sector. I've published over 300 articles and reports in my fields of interest, and participated in the U.S. Global Climate Change Research Program's third national assessment entitled "Global Climate Change Impacts in the United States."

While completing my Bachelors of Science degree in Conservation and Resource Studies at U.C. Berkeley in the mid-1980s, I studied and taught about green buildings with Sim van der Ryn before they were in vogue. I later received a Masters of Science degree from Berkeley's Energy and Resources Group (where I am now a Research Affiliate) in 1987 and a Ph.D. from the Department of Environmental and Energy Systems Studies under Thomas B. Johansson at Lund University in Sweden in 1991.

In Sweden, I worked closely with the Swedish State Power Board (Vattenfall) and the Swedish National Board for Industrial and Technical Development on energy planning projects and served as an energy advisor to the Swedish Parliamentary Working Group on Energy Futures. 

I am a member of the international body of scientists which as worked over the past two decades under the Intergovernmental Panel on Climate Change (IPCC), which collectively shared in the Nobel Peace Prize for 2007 with former U.S. Vice President Albert Arnold (Al) Gore Jr. "for their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change."