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Jessica Tuchman Mathews (born July 4, 1946) is a prominent American diplomat, environmentalist, and international affairs expert who served as president of the Carnegie Endowment for International Peace from 1997 to 2015. She has had a distinguished career spanning government, nonprofits, and journalism, with expertise in climate and energy, defense and security, nuclear weapons, and conflict and governance. Prior to her presidency at Carnegie, she held influential positions in both the executive and legislative branches of the U.S. government, including roles in the National Security Council and as a staff member for the Senate Committee on Foreign Relations. She also directed the Washington office of the Council on Foreign Relations and worked as a journalist for publications like The Washington Post. Throughout her career, Mathews has emphasized the intersection of environmental policy and global security, authoring influential reports on topics like nuclear proliferation and climate change. She has been recognized for her contributions to international peace and security with accolades such as the Woodrow Wilson Award and continues to engage in public discourse as a senior fellow and advisor.