Gillian serves as USAID’s Chief Climate Officer and is responsible for directing and overseeing all climate and environment work across the agency. She also serves as Deputy Assistant Administrator, overseeing REFS’ Center for Energy, Infrastructure, and Cities (REFS/CEIC); the Office of Environmental and Social Safeguarding (REFS/ECSS); Center for Climate Positive Development (REFS/CCPD); and the Center for Natural Environment (REFS/CNE). 

Ms. Caldwell has worked to protect human rights and the environment throughout her career. Prior to joining USAID, she served as the CEO of Global Witness, which has a focus on tackling climate change and deploys investigations into corruption and natural resource extraction to drive systems change worldwide. From 2007-2010, she launched and led 1Sky, a highly collaborative cross-sector campaign with over 600 allied organizations to pass legislation in the U.S. to address the climate crisis. Gillian also has extensive experience consulting in the areas of strategic planning and organizational development with over 70 non-profits, foundations, and universities. 

Ms. Caldwell has a B.A. from Harvard University and a J.D. from Georgetown University, where she was recognized as a Public Interest Law Scholar. She has received a series of awards recognizing her work as a leading global Social Entrepreneur.