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Josh Kertzer

@jkertzer

John Zwaanstra Professor of International Studies and of Government at Harvard University | International relations 🀝 political psychology jkertzer.sites.fas.harvard.edu

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23.08.2023
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Latest posts by Josh Kertzer @jkertzer

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Conceptualizing and Measuring Geopolitical Alignments A vast literature examines how geopolitical alignments influence militarized conflict, trade, investment, aid, and other outcomes in international relations. Yet, considerable ambiguity remains regard...

Conceptualizing and Measuring Geopolitical Alignments - www.annualreviews.org/content/jour...

03.03.2026 15:00 πŸ‘ 23 πŸ” 13 πŸ’¬ 1 πŸ“Œ 1

Writing an autoethnography about my experience watching academics attempt to use listservs

02.03.2026 17:15 πŸ‘ 10 πŸ” 1 πŸ’¬ 2 πŸ“Œ 1
Where’s the Sabotage? Repression, Recruitment, and Tactical Evolution in the U.S. Radical Environmental Movement. Thomas Zeitzoff   Why did the U.S. radical environmental movement shift away from tactics like arson and sabotage in the mid-2000s? And given the rising threat of climate change, why haven’t these more contentious tactics made a comeback? This puzzle is particularly significant to scholars of terrorism because radical environmental groups like the Earth Liberation Front appear in major terrorism databases, and faced heavy repression from the government, despite causing no fatalities. I argue that repression and recruitment networks play a central role in shaping tactical repertoires. To test this theory, I combine original data on eco direct actions (1995–2022), surveys, and interviews of activist experts. I find that repression sharply reduced the pace of direct actionsβ€”particularly sabotage and arsonβ€”and disrupted the punk and anarchist recruitment networks that had supported them. In their place, the climate justice movement emerged, favoring civil disobedience and mass protest over clandestine tactics. Repression thus altered the movement both directly (by targeting high-risk actors and their tactics) and indirectly (by reshaping recruitment pipelines). I conclude with a discussion of how climate politics, activist subcultures, repression, and the contested boundary of what constitutes terrorism may influence the future trajectory of radical environmentalism.

Where’s the Sabotage? Repression, Recruitment, and Tactical Evolution in the U.S. Radical Environmental Movement. Thomas Zeitzoff Why did the U.S. radical environmental movement shift away from tactics like arson and sabotage in the mid-2000s? And given the rising threat of climate change, why haven’t these more contentious tactics made a comeback? This puzzle is particularly significant to scholars of terrorism because radical environmental groups like the Earth Liberation Front appear in major terrorism databases, and faced heavy repression from the government, despite causing no fatalities. I argue that repression and recruitment networks play a central role in shaping tactical repertoires. To test this theory, I combine original data on eco direct actions (1995–2022), surveys, and interviews of activist experts. I find that repression sharply reduced the pace of direct actionsβ€”particularly sabotage and arsonβ€”and disrupted the punk and anarchist recruitment networks that had supported them. In their place, the climate justice movement emerged, favoring civil disobedience and mass protest over clandestine tactics. Repression thus altered the movement both directly (by targeting high-risk actors and their tactics) and indirectly (by reshaping recruitment pipelines). I conclude with a discussion of how climate politics, activist subcultures, repression, and the contested boundary of what constitutes terrorism may influence the future trajectory of radical environmentalism.

New in Terrorism & Political Violence: Why did radical environmental groups stop using arson & sabotage? And, given the threat from climate change why haven't those tactics returned?

My article "Where's the Sabotage" seeks to answer these questions.

Free link: www.tandfonline.com/eprint/QYFAW...

02.03.2026 16:53 πŸ‘ 22 πŸ” 9 πŸ’¬ 4 πŸ“Œ 2
Matching sounds to shapes: Evidence of the bouba-kiki effect in naΓ―ve baby chicks  Maria Loconsole1*, Silvia Benavides-Varela2,3, Lucia Regolin1  Humans across multiple languages spontaneously associate the nonwords β€œkiki” and β€œbouba” with spiky and round shapes, respectively, a phenomenon named the bouba-kiki effect. To explore the origin of this association, and whether it is unique to humans, we tested the bouba-kiki effect in baby domestic chickens (Gallus gallus). as a precocial species, chicks can be tested shortly after hatching, allowing us to control their pretest experiences. Similar to humans, both 3-day-old [experiment 1 (exp. 1)] and 1-day-old (exp. 2) chicks spontaneously choose a spiky shape when hearing the β€œkiki” sound and a round shape when hearing the β€œbouba” sound. results from naΓ―ve young animals suggest a predisposed mechanism for matching the dimensions of shape and sound, which may be widespread across species.

Matching sounds to shapes: Evidence of the bouba-kiki effect in naΓ―ve baby chicks Maria Loconsole1*, Silvia Benavides-Varela2,3, Lucia Regolin1 Humans across multiple languages spontaneously associate the nonwords β€œkiki” and β€œbouba” with spiky and round shapes, respectively, a phenomenon named the bouba-kiki effect. To explore the origin of this association, and whether it is unique to humans, we tested the bouba-kiki effect in baby domestic chickens (Gallus gallus). as a precocial species, chicks can be tested shortly after hatching, allowing us to control their pretest experiences. Similar to humans, both 3-day-old [experiment 1 (exp. 1)] and 1-day-old (exp. 2) chicks spontaneously choose a spiky shape when hearing the β€œkiki” sound and a round shape when hearing the β€œbouba” sound. results from naΓ―ve young animals suggest a predisposed mechanism for matching the dimensions of shape and sound, which may be widespread across species.

main fig from the paper showing the association between bouba/round and kiki/spiky in newborn chicks

main fig from the paper showing the association between bouba/round and kiki/spiky in newborn chicks

the new paper on bouba/kiki in chicks is utterly compelling

canonical, elegant method from comparative cogsci & its partner in developmental science, ultra-simple design, ultra-clear effects, no need for fancy analyses, machine learning, or AI

it appeared in an appropriately badass venue (Science)

20.02.2026 06:08 πŸ‘ 423 πŸ” 157 πŸ’¬ 11 πŸ“Œ 22
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This new paper offers practical solutions for pluralistic ignorance (when people assume their opinon is unpopular when many others share it):

-in loose cultures, share accurate information
-in tight ones, lowering the costs of speaking up can spark social change.
www.pnas.org/doi/10.1073/...

17.02.2026 22:11 πŸ‘ 39 πŸ” 17 πŸ’¬ 0 πŸ“Œ 0
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Lol

10.02.2026 01:55 πŸ‘ 11 πŸ” 1 πŸ’¬ 1 πŸ“Œ 1
Delegating Destruction: Coercive Threats and Automated Nuclear Systems | International Organization | Cambridge Core Delegating Destruction: Coercive Threats and Automated Nuclear Systems

Automated nuclear weapons systems are not just a Hollywood plot device.

In this #Firstview article, @joshschwartz.bsky.social and @mchorowitz.bsky.social evaluate how they could impact the credibility and effectiveness of nuclear threats.

www.cambridge.org/core/journal...

02.02.2026 17:38 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Our new ProjectGEOCAUSAL website is live! We’ll be posting the latest updates on cutting-edge applications of spatiotemporal causal inference to address the world’s most pressing problems. Check it out: geocausal.org

15.01.2026 04:22 πŸ‘ 7 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0
Screenshot of article title, bylines, and abstract.

Screenshot of article title, bylines, and abstract.

When leaders frame disputed land as β€œterritory we might lose” rather than β€œnew land to gain,” people in Argentina & Chile become more willing to support risky escalation and less willing to compromise. New study by @andizhou.bsky.social: https://loom.ly/cjdEJkM

09.01.2026 10:45 πŸ‘ 0 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Opinion | Trump Was Right to Oust Maduro

As the saying goes, every op-ed is a job talk www.nytimes.com/2026/01/05/o...

06.01.2026 13:47 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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A new paper finds ideological bias in research analyses:

Research teams composed of pro-immigration researchers estimated more positive impacts of immigration on public support for social programs, while anti-immigration teams estimated more negative impacts.
science.org/doi/10.1126/...?

05.01.2026 21:20 πŸ‘ 19 πŸ” 7 πŸ’¬ 2 πŸ“Œ 1
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New Special Issue in @the-peio.bsky.social: Public Opinion and International Organizations. In the SI intro, we map the field, place the SI papers & identify ways forward: rdcu.be/eXt2R with @jonastallberg.bsky.social, πŸ™ @adreher.bsky.social, reviewers & SI authors #Polisky #InternationalRelations

05.01.2026 11:03 πŸ‘ 30 πŸ” 15 πŸ’¬ 0 πŸ“Œ 0
Domestic Distributional Roots of National Interest
SOYOUNG LEE Yale University, United States, and Duke University, United States

What international issues become national interests worth fighting for, and why? Contrary to conventional wisdom, I argue that issues without clear economic value, such as barren lands, are more likely to be perceived as national interests because they do not benefit any single domestic group. Since who benefits is unclear, politicians have an easier time framing such issues as benefiting the whole nation. I test this argument using survey experiments on the American public. The results show that first, issues providing diffuse benefits to citizens are more likely to be considered national interests than issues providing concentrated benefits to certain domestic groups. Second, issues with clearer economic value are harder to frame as having diffuse benefits because they are more easily associated with specific beneficiaries. This study proposes a new theory of national interest and offers a potential explanation for why people frequently support conflict over issues without obvious benefits.

Domestic Distributional Roots of National Interest SOYOUNG LEE Yale University, United States, and Duke University, United States What international issues become national interests worth fighting for, and why? Contrary to conventional wisdom, I argue that issues without clear economic value, such as barren lands, are more likely to be perceived as national interests because they do not benefit any single domestic group. Since who benefits is unclear, politicians have an easier time framing such issues as benefiting the whole nation. I test this argument using survey experiments on the American public. The results show that first, issues providing diffuse benefits to citizens are more likely to be considered national interests than issues providing concentrated benefits to certain domestic groups. Second, issues with clearer economic value are harder to frame as having diffuse benefits because they are more easily associated with specific beneficiaries. This study proposes a new theory of national interest and offers a potential explanation for why people frequently support conflict over issues without obvious benefits.

Apropos current events, I want to tout this paper by @soyounglee.bsky.social showing that discussion of economic benefits can reduce public support for military action. People are skeptical when they think specific groups (e.g., oil companies) will benefit.

www.cambridge.org/core/journal...

05.01.2026 13:42 πŸ‘ 31 πŸ” 8 πŸ’¬ 0 πŸ“Œ 2
BJPolS abstract from a scholarly article about the perceived foreign policy failures of the US in Afghanistan and its impact on global perceptions of US leadership. The text mentions a survey across 24 countries and findings on changes in favorability after the fall of Kabul on 15 August 2021.

BJPolS abstract from a scholarly article about the perceived foreign policy failures of the US in Afghanistan and its impact on global perceptions of US leadership. The text mentions a survey across 24 countries and findings on changes in favorability after the fall of Kabul on 15 August 2021.

NEW -

Foreign Policy Failures and Global Attitudes Towards Great Powers: Evidence from the US Withdrawal from Afghanistan - https://cup.org/3YSsX4N

- @rachelmyrick.bsky.social & @wpmarble.bsky.social

#OpenAccess

02.01.2026 10:10 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

Coauthors Liz Sperber, O’Brien Kaaba and I have published 3 papers about youth civic ed and political participation, based on a WhatsApp experiment and a prior in-person pilot conducted in collaboration w/ Caritas Zambia CCMG Zambia @poverty-action.bsky.social and United Council of Churches Zambia

29.12.2025 21:43 πŸ‘ 17 πŸ” 7 πŸ’¬ 1 πŸ“Œ 0
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New paper in @ajpseditor.bsky.social. Is descriptive representation good for substantive representation? Why do voters stay loyal to corrupt and poorly governing ethnic parties? I argue that we ought to focus less on patronage and more on dignity concerns. Defiant pride can come at a price. 1/🧡

08.12.2025 22:01 πŸ‘ 116 πŸ” 40 πŸ’¬ 3 πŸ“Œ 5
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2026 Grawemeyer world order award winner explores the connection between climate change and security | UofL News For his work to understand why climate change leads to negative security consequences in some places and not others, Joshua W. Busby, professor of public affairs at the University of Texas at Austin, ...

Some news. My book on climate and security for Cambridge University Press is the winner of the 2026 Grawemeyer Award for Ideas Advancing World Order. Thrilled to be among the august company of previous winners. www.uoflnews.com/post/uofltod...

02.12.2025 14:06 πŸ‘ 97 πŸ” 20 πŸ’¬ 18 πŸ“Œ 5
"ladies and gentlemen, the weeknd" (HD Original)
"ladies and gentlemen, the weeknd" (HD Original) YouTube video by Steadfast

A friendly reminder that some of you should really spend less time online

30.11.2025 15:31 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
BJPolS abstract discussing the nostalgia for empire in post-imperial European contexts, examining public opinion and attitudes towards imperial history.

BJPolS abstract discussing the nostalgia for empire in post-imperial European contexts, examining public opinion and attitudes towards imperial history.

NEWS -

The Politics of Imperial Nostalgia - https://cup.org/4p1QbRA

"right-wing opposition to criticism of the imperial past is stronger than left-wing support"

- Christopher Claassen & @danjdevine.bsky.social

#OpenAccess

24.11.2025 14:50 πŸ‘ 19 πŸ” 7 πŸ’¬ 1 πŸ“Œ 2
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Our online special issue, The Future of Global Governance and World Order, is out!

It features 15 short essays plus the editors' introduction, all #OpenAccess.

www.cambridge.org/core/journal...

#IOFoGG

20.11.2025 11:21 πŸ‘ 42 πŸ” 24 πŸ’¬ 1 πŸ“Œ 9
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For the first Encode/Decode post, go back to @jkertzer.bsky.social, @ryanbrutger.bsky.social & Kai Quek's @worldpolitics.bsky.social article using cross-national #survey #experiments in #China and the #US to test for a #security dilemma. Read their original #empirical work: doi.org/10.1353/wp.2...

22.10.2025 16:56 πŸ‘ 7 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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Congratulations to @yusakuhoriuchi.bsky.social and @kmatush.bsky.social for the launch of the Global Public Opinion Lab (GPOL) at Florida State! Lots of exciting plans in the works!

(I couldn't take any pictures of public opinion, so here's one of Spanish moss)

18.11.2025 14:36 πŸ‘ 12 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0

Sidney Smith! 🫑

11.11.2025 18:02 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Atomic responsiveness: How public opinion shapes elite beliefs and preferences on nuclear weapon use | European Journal of International Security | Cambridge Core Atomic responsiveness: How public opinion shapes elite beliefs and preferences on nuclear weapon use

Does public opinion matter for nuclear policy? We say yes, in @ejisbisa.bsky.social.

Whether the public backs nuclear use can sway leaders’ preferences and affects external perceptions of the credibility of deterrence.

doi.org/10.1017/eis....

11.11.2025 15:16 πŸ‘ 9 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0
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You could not pay me enough to voluntarily use a yeet() or no_cap() command in R

07.11.2025 17:53 πŸ‘ 9 πŸ” 0 πŸ’¬ 0 πŸ“Œ 1

We propose a spatiotemporal causal inference framework that fully leverages microlevel, granular data. ATE, heterogeneity, and mediation β€” all in one framework. Now with updated results and visualizations!

07.11.2025 16:56 πŸ‘ 6 πŸ” 5 πŸ’¬ 0 πŸ“Œ 0

🚨 New in @bjpols.bsky.social :
β€œEstimating the Impact of Drone Strikes on Civilians Using Call Detail Records.”
By Bertolotti, Milliff, Christia & Jadbabaie.

We use 12 billion call records from Yemen to measure the civilian consequences of drone warfare.

1/6

04.11.2025 15:18 πŸ‘ 13 πŸ” 3 πŸ’¬ 1 πŸ“Œ 0
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How to Put IR Theory Into Practice American strategists should think more like social scientists.

β€œThe divide between international relations theory and practice is problematic in normal times, and downright dangerous in turbulent ones,” write Stacie Goddard and @jkertzer.bsky.social.

31.10.2025 16:04 πŸ‘ 9 πŸ” 2 πŸ’¬ 1 πŸ“Œ 1

1/In honor of no kings! Imagine an international order organized not around nation-states but hyper elites pledged to absolute rulers. Welcome to neo-royalism. New w/Stacie Goddard in International Organization. We use the approach to rethink US policy in Trump era.
www.dropbox.com/scl/fi/mxthh...

16.10.2025 10:50 πŸ‘ 43 πŸ” 20 πŸ’¬ 2 πŸ“Œ 4
Polarization and International Politics: How Extreme Partisanship Threatens Global Stability by Rachel Myrick

Polarization and International Politics: How Extreme Partisanship Threatens Global Stability by Rachel Myrick

In Polarization and International Politics, @rachelmyrick.bsky.social explains how extreme polarization undermines the advantages that democracies have when formulating foreign policy.

Available worldwide. Explore a free sample of this timely book: press.princeton.edu/books/paperb...

11.10.2025 19:28 πŸ‘ 10 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0