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Mackenzie Eaglen is a senior fellow at the American Enterprise Institute (AEI), where she works on defense strategy, defense budgets, and military readiness. She is also a regular guest lecturer at universities, a member of the board of advisers of the Alexander Hamilton Society, and a member of the steering committee of the Leadership Council for Women in National Security.

Ms. Eaglen also serves on the 12-member US Army War College Board of Visitors, which offers advice about academic program objectives and effectiveness, and the US Army Science Board, an advisory body that provides guidance on scientific and other matters to the Army’s senior leadership. In 2023, she became a member of the Commission on the Future of the Navy, established by Congress to study the strategy, budget, and policy concerning the future strength of the US Navy fleet.

While working at AEI, Ms. Eaglen served as a staff member on the National Defense Strategy Commission, a congressionally mandated bipartisan review group whose final report in November 2018, Providing for the Common Defense, included assessments and recommendations for the administration. Earlier, Ms. Eaglen served as a staff member on the 2014 congressionally mandated National Defense Panel and in 2010 on the congressionally mandated bipartisan Quadrennial Defense Review Independent Panel.

Before joining AEI, Ms. Eaglen worked on defense issues in the House of Representatives, in the US Senate, and at the Pentagon in the Office of the Secretary of Defense and on the Joint Staff.

A prolific writer on defense-related issues, Ms. Eaglen has been published in the popular press, including in Foreign Affairs, the New York Times, Politico, the Wall Street Journal, the Washington Post, and War on the Rocks. She has also testified before Congress.

Ms. Eaglen has an MA from the Edmund A. Walsh School of Foreign Service at Georgetown University and a BA from Mercer University.