Daniel S. Greenbaum is the president and chief executive officer of the Health Effects Institute (HEI), an independent not-for-profit research institute funded jointly by government and industry to provide trusted research on the health effects of air pollution. At HEI, Mr. Greenbaum has overseen the development and implementation of a strategic research plan that focuses the institute’s efforts on providing critical research on and reanalysis of particulate matter, air toxics, and alternative fuels, increasingly on an international scale. He has served as chair of the Environmental Protection Agency (EPA) Blue Ribbon Panel on Oxygenates in Gasoline, as chair of EPA’s Clean Diesel Independent Review Panel, and as a member of the national Clean Air Act Advisory Committee. Before joining the Health Effects Institute, he served as commissioner of the Massachusetts Department of Environmental Protection. Mr. Greenbaum earned a master’s degree in city planning from the Massachusetts Institute of Technology.