Jeb Sharp has been reporting for *The World* since 1998. Her assignments have taken her to Africa, Europe and the Middle East. She covers foreign policy and human rights and is currently working on a historical series about how wars end. Her radio stories have been honored by the Overseas Press Club and the Society of Professional Journalists. Jeb was a Nieman Fellow at Harvard in 2006. She learned how to do radio at the Graduate School of Journalism at U.C. Berkeley and began her career at KCAW-FM in Sitka, Alaska. She has also worked at WBUR in Boston.

Christopher Flavin is President of the Worldwatch Institute, a Washington-based international research organization focused on energy, resource and environmental issues. Worldwatch is recognized around the world for its pathbreaking work on the global connections between economic, social, and environmental trends. Chris has spent his career at Worldwatch where he previously served as Senior Vice President and Vice President for Research. Chris is a leading voice on the need to build a low-carbon economy that will meet human needs without undermining the Earth's ecological support systems. He is co-author of three books on energy, including *Power Surge: Guide to the Coming Energy Revolution*, which anticipated many of the changes now under way in world energy markets. Chris is a regular co-author of the Institute's annual *State of the World* report, which has been published in 36 languages. He has participated in several historic international conferences, including the Earth Summit in Rio de Janeiro in 1992 and the Climate Change Conference in Kyoto, Japan, in 1997.Chris appears regularly in the national and international media, including outlets such as the BBC, National Public Radio, CNN, PBS Newshour, and Voice of America.

Williams Holmberg is the Chairman and President of Renew the Earth and the Chairman of the Board at the New Uses Council and the Biomass Coordinating Council of the American Council on Renewable Energy. Holmberg has worked for the EPA where he helped pioneer the use of ethanol as fuel, integrated the registration of biological pesticides, and fostered organic farming programs. He also helped establish the Office of Alcohol Fuels at the Department of Energy. Holmberg is a US Naval Academy graduate and has served in the Marine Corps. He has been awarded the Navy Cross, the Bronze Star and Purple Heart, the Joint Service Commendation Medal and the EPA Silver Medal. Holmberg has advanced degrees in Personnel Administration, Russian Language, Soviet Affairs, and in Amphibious and Integrated Combat Operations.

Jefferson W. Tester received a Ph.D. from MIT in 1971 and did post-doctoral research at the Los Alamos National Laboratory. Tester served as director of MIT's Energy Laboratory for 12 years and was director of MIT's School of Chemical Engineering Practice Program for 10 years. His research focuses on energy and environmental issues. Specific topics include kinetics and phase equilibria in hydrothermal and supercritical water, molecular thermodynamics in water-hydrocarbon-salt systems, chemical synthesis in supercritical solvents, advanced rock drilling methods, and fuel upgrading and biomass conversion. He has co-authored more than 180 scientific papers and 9 books including major textbooks on graduate-level thermodynamics and sustainable energy and has received five awards for outstanding teaching. Tester is a member of the American Institute of Chemical Engineers, American Chemical Society, the Society of Petroleum Engineers, Tau Beta Pi, Sigma Xi, and the Geothermal Resources Council. He has served as an advisor to the United States Department of Energy, Defense Science Board, and the National Research Council. He is the chair of the National Advisory Council of the National Renewable Energy Laboratory and chair of the Massachusetts Renewable Energy Trust. Tester also serves on scientific advisory boards for the American Council on Renewable Energy, Los Alamos National Laboratory, and the Paul Scherrer Institute in Switzerland. He is on the editorial board of *the Journal of Supercritical Fluids*.