Doreen Horschig

Fellow, Project on Nuclear Issues
Doreen Horschig

Doreen Horschig is a fellow with the Project on Nuclear Issues at the Center for Strategic and International Studies (CSIS). She is also a non-resident research associate at the School of Politics, Security, and International Affairs at the University of Central Florida (UCF). Previously, Doreen was a nuclear security policy fellow at the American Academy of Arts and Sciences and a Stanton nuclear security fellow at the Massachusetts Institute of Technology. Her research examines proliferation, nonproliferation, and counterproliferation, as well as nuclear norms contestation and public opinion on nuclear issues. Doreen’s works has been published in Third World Quarterly, Journal of Global Security Studies, Foreign Affairs, War on the Rocks, Lawfare, and others. She holds a PhD in security studies from UCF, an MA in international relations from New York University, and a BA in international studies from Manhattan College.

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On the Horizon, Vol. 8

The 2025 PONI Nuclear Scholars explore the future of nuclear strategy, offering perspectives from emerging experts on disruptive technology, intensifying geopolitical rivalries, and strategic stability.

Report by Doreen Horschig — December 18, 2025

Strategic Trends 2025

In a world where old nuclear guardrails are eroding and new rivalries are converging, Strategic Trends 2025 charts how the United States and its allies must navigate a disorderly, multi-adversary nuclear landscape and rethink deterrence for an unpredictable era.

Report by Nicholas Adamopoulos, Diya Ashtakala, Doreen Horschig, Lachlan MacKenzie, Catherine Murphy, Joseph Rodgers, Bailey Schiff, Pranay Vaddi, Heather Williams, and Reja Younis — November 18, 2025

Audio Briefs

Could the Pakistani-Saudi Defense Pact Be the First Step Toward a NATO-Style Alliance?

An audio version of “⁠Could the Pakistani-Saudi Defense Pact Be the First Step Toward a NATO-Style Alliance?⁠,” a new Critical Questions by CSIS’s Diya Ashtakala, Doreen Horschig, and Bailey Schiff. This audio was generated with text-to-speech by Eleven Labs. 

Podcast Episode by Diya Ashtakala, Doreen Horschig, and Bailey Schiff — October 6, 2025

Audio Briefs

Could the Pakistani-Saudi Defense Pact Be the First Step Toward a NATO-Style Alliance?

The pact reshaped regional dynamics by deepening Pakistani-Saudi ties, straining India’s balancing act, and raising questions about Israel’s air access. Despite its NATO-style language, it lacks the nuclear and political basis for true collective defense.

Critical Questions by Diya Ashtakala, Doreen Horschig, and Bailey Schiff — October 6, 2025

Audio Briefs

The Fallout Factor in Targeting Iran’s Nuclear Program

An audio version of “⁠The Fallout Factor in Targeting Iran’s Nuclear Program⁠,” a new Commentary by CSIS’s Doreen Horschig and Bailey Schiff. This audio was generated with text-to-speech by Eleven Labs. 

Podcast Episode by Doreen Horschig and Bailey Schiff — June 23, 2025

Audio Briefs

The Fallout Factor in Targeting Iran’s Nuclear Program

Operation Midnight Hammer may mark the ceiling that conventional force can achieve against Iran’s nuclear program without triggering fallout. For Israel, this means future operations will likely involve sites that are more fortified or environmentally risky, or both.

Commentary by Doreen Horschig and Bailey Schiff — June 23, 2025

Israel and Iran At War: What Comes Next? 

CSIS experts Daniel Byman and Doreen Horschig join Mona Yacoubian to discuss current developments in the Iran-Israel conflict, moderated by Will Todman.

Event — June 17, 2025

Audio Briefs

What Do the Israeli Strikes Mean for Iran’s Nuclear Program?

An audio version of “⁠What Do the Israeli Strikes Mean for Iran’s Nuclear Program?⁠,” a new Critical Questions by CSIS's Heather Williams, Doreen Horschig, and Bailey Schiff. This audio was generated with text-to-speech by Eleven Labs. 

Podcast Episode by Heather Williams, Doreen Horschig, and Bailey Schiff — June 13, 2025

Audio Briefs

What Do the Israeli Strikes Mean for Iran’s Nuclear Program?

Israel launched an unprecedented attack on Iran’s nuclear and military sites. The future of Iran’s program and regional proliferation risks will depend on the success of Israel’s campaign, the international response, and Tehran’s perceived need for nuclear weapons.

Critical Questions by Heather Williams, Doreen Horschig, and Bailey Schiff — June 13, 2025

What Factors Drive U.S.-Israeli Differences on Iran’s Nuclear Challenge?

U.S.-Israeli differences over the Iranian nuclear challenge are growing. With Washington signaling interests in diplomacy and Israel advocating for military action, their diverging strategies could affect strategic alignment and coordination.

Critical Questions by Doreen Horschig and Bailey Schiff — April 4, 2025