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Executive Director
UCS Executive Director Kathleen Rest, an expert on public health and the environment, oversees the organization’s day-to-day operations.
Senior Energy Analyst
As a senior energy analyst in the Climate and Energy Program, Jeremy Richardson conducts analytical work on the Environmental Protection Agency’s carbon regulations and other areas of energy research.
Director, Clean Vehicles Program
Michelle Robinson, director of the UCS Clean Vehicles Program, is a recognized expert on state and federal transportation policy.
John Rogers
Senior Energy Analyst
John Rogers, a senior analyst in the UCS Climate & Energy Program, manages the energy and water project, which is helping implement a range of renewable energy, climate, and other clean energy policies.
Director, Center for Science and Democracy
Andrew Rosenberg, director of the UCS Center for Science and Democracy, leads our efforts to advance the essential role that science, evidence-based decision making, and constructive debate play in American policy making.
Director, Food & Environment Program
Ricardo Salvador, an expert in sustainable agriculture practices, is a senior scientist and director of the UCS Food & Environment Program.
Senior Energy Modeler
Sandra Sattler is a senior energy modeler in the UCS Climate and Energy Program, where she analyzes and models clean energy, energy efficiency, and global warming policies at the state, regional, and national level.
Senior Analyst, Climate & Energy Program
Erika Spanger-Siegfried, a senior analyst in the Climate and Energy program at the Union of Concerned Scientists, researches, writes and speaks about U.S. climate change impacts and preparedness.
Energy Analyst
Mark Specht is an energy analyst for the Climate...
Karen Perry Stillerman
Sr. Communication Strategist and Sr. Analyst, Food & Environment Program
Karen Perry Stillerman is senior communication strategist and senior analyst in the UCS Food and Environment Program, where she leads initiatives and shapes research aimed at transforming and modernizing the American food system to make it healthier for consumers and the environment.

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