The Borders and Boundaries Project
Do international borders matter in the modern world, and, if so, in what ways?

The Borders and Boundaries Project at Perry World House is researching how political life both affects and is affected by international borders and border security policies. This interdisciplinary, multi-method effort is directed by Professor Beth Simmons and is composed of research teams studying border politics across a variety of different research areas. These include: a geo-spatial analysis of whether, where, and why some states choose to project their presence at international border crossings; a textual analysis of the discourse surrounding international borders; and an investigation of how public opinion is both shaping and shaped by border policies around the world.
Read more about the project’s research foci, meet the Borders and Boundaries team, and explore ongoing projects.
Personnel
Principle Investigator

Beth Simmons is an Andrea Mitchell Penn Integrates Knowledge University Professor of Law, Political Science and Business Ethics at the University of Pennsylvania. Supported by the National Science Foundation and the Carnegie Foundation, Simmons is currently researching the paradox of hardening international borders in an era of globalization. Two of her books, Who Adjusts? Domestic Sources of Foreign Economic Policy During the Interwar Years (2004) and Mobilizing for Human Rights: International Law in Domestic Politics (2009) won the American Political Science Association’s Woodrow Wilson Award for the best book published in the United States on government, politics, or international affairs. The latter was also recognized by the American Society for International Law, the International Social Science Council and the International Studies Association as the best book of the year in 2010. Simmons directed the Weatherhead Center for International Affairs at Harvard, is a past president of the International Studies Association, and has been elected to the National Academy of Sciences, the American Academy of Arts and Sciences, and the American Philosophical Society. Simmons leads the Borders and Boundaries Project, part of our Global Shifts theme, at Perry World House. Her research group is documenting and will explain the paradox of hardening international borders between states in an era of globalization using satellite imagery as evidence of state presence at international border crossings.
Associated Faculty Partners

Michael Kenwick is an assistant professor of political science at Rutgers University. He studies international security with an emphasis on civil-military relations and international border politics. His research has been supported by the National Science Foundation and has appeared in a variety of journals including the American Journal of Political Science, International Organization, and the Journal of Politics. From 2017 to 2019, he was a postdoctoral fellow at Perry World House, where he played an active role in establishing the Borders and Boundaries Project, a multidisciplinary initiative exploring the causes and consequences of intensified border control efforts. He received his PhD in political science from the Pennsylvania State University, and his BA in political science and history from the University of Illinois.

Gino Pauselli is an assistant professor in the Department of Political Science at the University of Illinois, Urbana-Champaign, specializing in the intersection of human rights, global governance, and transnational advocacy. Previously, he was a Postdoctoral Fellow in the Niehaus Center for Globalization and Governance at Princeton University (2023-2024). His research uses rigorous statistical methods to analyze the dynamics of norms adoption and resistance within global governance systems, with a focus on how international actors (including NGOs, intergovernmental organizations, and transnational networks) shape policy reform and accountability mechanisms. His research has been awarded by the American Political Science Association and the International Studies Association.

Rachel Ann Hulvey is an incoming Assistant Professor at Indiana University. Rachel researches China’s influence on international order with an empirical focus on cyberspace. She graduated with a PhD from the Department of Political Science at the University of Pennsylvania in 2024. Her book project, Mobilizing for Sovereignty: How China Gains Global Influence, examines China’s rise and influence on world order. How does China attempt to impact international order, and what strategies does it pursue to gain influence? Given these strategies, when is China successful? As China seeks to establish new rules of the game, would some countries join the proposals it advances, and, if so, which ones?
Postdoctoral Fellows

Muhib Rahman’s research focuses on the use, diffusion, and evolving impacts of border technologies, particularly the transformation of borders into increasingly “smart” systems over time. His broader research interests include armed conflict, border security, security cooperation, and civil-military relations. His dissertation investigated how institutionalized defense cooperation and border fortification affected domestic politics, focusing on elite defection and anti-government armed uprisings. He also explores the intersections of political violence and foreign policy, with implications for democratic backsliding in the Global South. Rahman holds an M.A. in Political Science from McGill University and a Ph.D. in Government from the University of Texas at Austin.

Eric (Keun Woo) Jeong’s research explores how geopolitical disruptions influence creativity and innovation. From the innovation race int he United States following World War II to Renaissance Italy following the Dark Ages, throughout history, many breakthrough ideas that revolutionized our thinking and society were born in times of disruption. His research focuses on the historical occurrences of such disruptions, revealing distinct channels through which disruptions stimulate creativity and innovation in the contexts of painting, classical music, and literary art
Postdoctoral Fellows Alumni
- Suji Kang (2023-2025) Assistant Professor, Hong Kong University of Science and Technology
- Biz (Elizabeth) Herman (2022-2024), Researcher, International Rescue Committee
- Junghyun Kim (2022-2024), Assistant Professor, UNC Chapel Hill
- Bailee Donahue (2021-2023), Writing Center, Naval War College
- Richard McAlexander (2020-2022), Data Scientist, Instacart
- Lauren Pinson (2019-2021), Research Scientists, Chan Zuckerberg Initiative
- Robert Shaffer (2018-2020), Data Scientist, Centers for Medicare & Medicaid Services
- Benjamin Laughlin (2017-2019), Assistant Professor, NYU Abu Dhabi
- Michael Kenwick (2017-2019), Associate Professor, Rutgers University
Since 2018, the Borders and Boundaries Lab at Perry World House has researched a broad range of topics associated with border hardening around the world. By topic, these include:
Border Infrastructure (start date 2018): States are rapidly building physical infrastructure along their borders to block and filter transnational flows of goods and people. This segment of the project collected geocoded data on international border walls and crossings, while developing conceptual tools necessary to evaluate how these investments impact a variety of political and economic activities. The most recent expansion of the border infrastructure investigation involves more in-depth documentation and analysis of technology deployed to secure international borders.
Simmons, Beth A, and Michael Kenwick. 2022. “Border Orientation in a Globalizing World: Concept and Measurement.” American Journal of Political Science 66(4): 853-70. Replication data.
Kenwick, Michael R, Beth A Simmons, and Richard J McAlexander. 2024. “Infrastructure and Authority at the State’s Edge: The Border Crossings of the World Dataset.” Journal of Peace Research 61(3): 500-10. Replication data.
Kenwick, Michael R, Gino Pauselli, and Beth A Simmons. 2025. “Trust or Fortify? Border Walls in International Relations.” Working Paper, University of Pennsylvania.
Border Psychology, Sentiments, and Attitudes (start date 2019): Border anxiety is said to be on the rise in many parts of the world. Public opinion about border hardening has polarized in parts of the world as well. This part of the project uses text as data, public opinion surveys and experimental evidence to explore how attitudes and anxieties about international borders differ across time and space.
Mutz, Diana C, and Beth A Simmons. 2022. “The Psychology of Separation: Border Walls, Soft Power, and International Neighborliness.” Proceedings of the National Academy of Sciences 119(4): 7. Replication data.
Simmons, Beth A, and Robert Shaffer. 2024. “Border Anxiety in International Discourse.” American Journal of Political Science 68(2): 661-77. Replication data.
Pinson, Lauren E, and Beth A Simmons. 2023. “Symbolism and Polarization in American Public Opinion: The Case of Border Security.” Working Paper, University of Pennsylvania.
Borders, Migration, and Immigration Policy (start date 2020): How does international border structure affect international migration volumes and characteristics of migrants? This project empirically tests the impact of change in physical border structure on international migration patterns globally using a variety of sources of data.
Kenwick, Michael, and Beth A Simmons. 2020. “Pandemic Response as Border Politics.” International Organization 74(Supplemental issue. E.1 ): E36-E58. Replication data.
Shaffer, Robert, Lauren E Pinson, Jonathan A Chu, and Beth A Simmons. 2020. “Local Elected Officials’ Receptivity to Refugee Resettlement in the United States.” Proceedings of the National Academy of Sciences117(50): 31722-28. Replication data
Border Transactions (start date 2021): How does the built environment at land borders shape transaction costs associated with trade? This research group uses fine grained trade data and geolocated measures of border infrastructure to understand how built environment at border crossings can facilitate or hinder trade.
Donahue, Bailee and Beth A Simmons. 2023. Crafting the Neoliberal Border: Infrastructure, Social Purpose, and Transborder Trade. Working Paper. University of Pennsylvania.
Virtual Borders (start date 2022): The internet brings challenges that threaten national identities and the foundations of what it means to be a state. By collecting a variety of data on state practices for regulating the internet, we show that even in the “borderless” information age, decisions to control data flows are guided by states’ border orientations for managing cross-border traffic.
Hulvey, Rachel, and Beth A Simmons. Forthcoming, 2025. “Borders in Cyberspace: Digital Sovereignty through a Bordering Lens.” International Studies Quarterly.
Simmons, Beth A, and Rachel A Hulvey. 2023. “Cyberborders: Exercising State Sovereignty Online.” Temple Law Review 95(4): 617-40.
Borders, Human Health and Human Rights (start date 2023): This segment of the project collects data on human rights and well-being in and around border zones. We research severe rights violations by border agents, document transnational human trafficking corridors, and explore physical and mental health impacts in border areas.
Pauselli, Gino, and Beth A Simmons. 2023. “Borders, Barriers, and Health Outcomes at the Edge of State Sovereignty.” Working Paper, University of Pennsylvania.
Pauselli, Gino, and Beth A Simmons. 2024. “From Barriers to Abuse: Border Hardening and Torture Allegations.” Working Paper, University of Pennsylvania.
Pinson. Lauren E. and Beth A. Simmons. 2024. The Human Trafficking Corridors Database (HTCD). Working Paper, University of Pennsylvania.
Herman, Elizabeth, Adam Brown and Beth A Simmons. 2025. A Proposed Research Agenda on Border Trauma. Working Paper, University of Pennsylvania.
Associated Publications
Simmons, Beth A. 2019. “Border Rules.” International Studies Review 21(2): 256-83.
Simmons, Beth A, and Hein E Goemans. 2021. “Built on Borders: Tensions with the Institution Liberalism (Thought It) Left Behind.” International Organization 75(2): 387-410.
Simmons, Beth. 2023. “International Borders: Yours, Mine, and Ours.” University of Chicago Legal Forum 241.
Kenwick, Michael, Junghyun Lim, Skyler Crane, Scott Wehrwein, and Beth A Simmons. 2025. “Estimating the Legibility of International Borders.” Proceedings of the National Academy of Sciences 122(6): e2417812122. Replication data.