Seamus P. Daniels

Fellow, Defense Budget Analysis
Seamus Daniels

Seamus P. Daniels is a fellow for Defense Budget Analysis in the Defense and Security Department at the Center for Strategic and International Studies (CSIS). His research focuses on U.S. and global defense funding, defense posture and force structure, and acquisition. He has authored publications on trends in the U.S. defense budget and the defense appropriations process, U.S. defense posture and readiness, military personnel costs, naval shipbuilding, and NATO burden sharing. Mr. Daniels is also a term member of the Council on Foreign Relations. Prior to joining CSIS, he worked for Government Executive Media Group. Mr. Daniels holds an MA in international relations from Johns Hopkins University School of Advanced International Studies and an AB from Princeton University’s School of Public and International Affairs with minors in Near Eastern studies and Arabic language and culture.

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Executive Education

All About the Base: Acquisition Crash Course

Dive deep into the acquisition processes and industrial base issues impacting government and industry with exclusive insights from CSIS experts in this dynamic one-day course.

Course Date: March 3, 2027
Registration Closes: February 22, 2027

FY 2027 Defense Funding: Potential Post-Midterm Outcomes

Congress has a full post-midterm agenda, with action needed to fund the Department of Defense and federal government and reconciliation legislation to consider. Seamus Daniels lays out the factors that will shape FY 2027 defense funding decisions after the midterms.

Commentary by Seamus P. Daniels — October 28, 2026

Evaluating Pathways for U.S. Shipbuilding Cooperation with Allies

This report examines how deeper cooperation with allies—particularly South Korea and Japan—could help the United States attain the naval capabilities it needs. 

Report by Henry H. Carroll, Cynthia R. Cook, Seamus P. Daniels, and Oliver B. Buntin — August 10, 2026

Wartime Footing: A Two-Front Strategy to Confront China and Russia

The United States and its allies face a growing threat from an axis led by China and Russia. This report outlines a two-war planning construct focused on Asia and Europe, and a wartime industrial base focused on low-cost unmanned systems and long-range precision strike.

Report by Seth G. Jones, Seamus P. Daniels, Riley McCabe, and Daniel Byman — June 8, 2026

Unpacking the $1.5 Trillion FY 2027 Defense Budget Topline

On April 3, the White House released details of its defense budget request for FY 2027. Seamus Daniels unpacks the $1.5 trillion topline requested for national defense and its implications for congressional action.

Critical Questions by Seamus P. Daniels — April 10, 2026

Audio Briefs

Unpacking the $1.5 Trillion FY 2027 Defense Budget Topline

An audio version of "⁠Unpacking the $1.5 Trillion FY 2027 Defense Budget Topline⁠," a new Critical Questions by CSIS's Seamus P. Daniels. This audio was generated with text to speech by Eleven Labs.

Podcast Episode by Seamus P. Daniels — April 10, 2026

Audio Briefs