Kei Koizumi (he/his) is a longtime science-policy leader, science policy researcher, and social scientist in Washington, DC. From January 2021 to January 2025, he served as President Biden’s appointee at the White House Office of Science and Technology Policy (OSTP), most recently as Special Assistant to the President and Principal Deputy Director for Science, Society, and Policy, earlier as Principal Deputy Director for Policy, Chief of Staff, and Acting Director. He was also Acting Executive Director of the National Science and Technology Council from 2022-2024. Before that, he served as Senior Advisor for Science Policy at the American Association for the Advancement of Science (AAAS) between 2017 and 2019. He was Assistant Director for Federal R&D, and Senior Advisor for the National Science and Technology Council, at OSTP from 2009 to 2016 in the Obama Administration. Before that, he was the longtime Director of the AAAS R&D Budget and Policy Program. Mr. Koizumi received his MA in International Science and Technology Policy at the George Washington University (where he has taught science policy) and his BA from Boston University in Political Science and Economics. He is a Fellow of the AAAS.