John Holdren is the Teresa and John Heinz Research Professor for Science and International Affairs at Harvard University’s Kennedy School of Government and co-director of the Science, Technology, and Public Policy Program at the School’s Belfer Center for Science and International Affairs. He is a former Professor of Environmental Science and Policy in the Department of Earth and Planetary Sciences, and Affiliated Professor in the John A. Paulson School of Engineering and Applied Science. He is also President Emeritus and Senior Advisor to the President at the Woodwell Climate Research Center, a pre-eminent, independent, environmental-research organization. From 2009 to 2017, Holdren was President Obama’s Science Advisor and Director of the White House Office of Science and Technology Policy, becoming the longest-serving Science Advisor to the President in the history of the position. Before joining Harvard, was a professor of energy resources at the University of California, Berkeley, where he founded and led the interdisciplinary graduate-degree program in energy and resources. Prior to that he was a theoretical physicist in the Theory Group of the Magnetic Fusion Energy Division at the Lawrence Livermore National Laboratory and a Senior Research Fellow at Caltech. He has been a member of the Board of Trustees of the MacArthur Foundation and Chairman of the Committee on International Security and Arms Control at the National Academy of Sciences. During the Clinton Administration, he served for both terms on the President’s Council of Advisors on Science and Technology, leading multiple studies on energy-technology innovation and nuclear arms control. He is a member of the U.S. National Academy of Sciences, the U.S. National Academy of Engineering, the American Philosophical Society, the American Academy of Arts and Sciences, the American Academy of Political and Social Science, and the Council on Foreign Relations. He is also a foreign member of the Royal Society of London and the Indian National Academy of Engineering and a former President of the American Association for the Advancement of Science. His many honors include one of the first MacArthur Prize Fellowships (1981) and the Moynihan Prize of the American Academy of Political and Social Sciences. In 1995, he gave the acceptance speech for the Nobel Peace Prize on behalf of the Pugwash Conferences on Science and World Affairs, an international organization of scientists and public figures. He holds SB and SM degrees from MIT in aeronautics and astronautics and a Ph.D. from Stanford in aeronautics and astronautics and theoretical plasma physics.

Jennifer Spence is the Director of the Arctic Initiative at Harvard Kennedy School’s Belfer Center for Science and International Affairs, with expertise related to sustainable development, international governance, institutional effectiveness, and public policy. Spence currently co-chairs the Arctic Research Cooperation and Diplomacy Research Priority Team for the Fourth International Conference on Arctic Research Planning (ICARP IV), participates as a member of the Climate Expert Group for the Arctic Council’s Arctic Monitoring and Assessment Programme, and sits as a member of the Yukon Arctic Security Advisory Council. Spence was the Executive Secretary of the Arctic Council’s Sustainable Development Working Group from 2019-2023. Previously, she taught and conducted research at Carleton University and worked for a 2-year term at the United Nations Development Programme. She also worked for 18 years with the Government of Canada in senior positions related to resource management, conflict and change management, strategic planning, and leadership development. Spence holds a Ph.D. in public policy from Carleton University, a MA from Royal Roads University in conflict management and analysis, and a BA in political science from the University of British Columbia.

Ralph Ranalli of the HKS Office of Communications and Public Affairs is the host, producer, and editor of HKS PolicyCast. A former journalist, public television producer, and entrepreneur, he holds an BA in political science from UCLA and a master’s in journalism from Columbia University.

Scheduling and logistical support for PolicyCast is provided by Lilian Wainaina.Design and graphics support is provided by Laura King and the OCPA Design Team. Web design and social media promotion support is provided by Catherine Santrock and Natalie Montaner. Editorial support is provided by Nora Delaney and Robert O’Neill.