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Juan Masullo J.

Political Scientist

(and passionate rock climber)

I'm an Assistant Professor at the Institute of Political Science at Leiden University and a member of the Amsterdam Conflict Research Network.  My research employs a variety of methods to study political and criminal violence, especially in Latin America.



I am an Assistant Professor at the Institute of Political Science, Leiden University, and a member of the Amsterdam Conflict Research Network (ACRN). I serve as co-editor oQualitative & Multi-Method Research, the biannual publication of APSA’s Qualitative and Multi-Method Research Section, and I'm part of the Editorial Board of the International Studies Review

My research combines multiple types of methods and evidence, often involving extensive fieldwork, to study political and criminal violence. I'm particularly interested in how individuals and communities living in violent settings make choices and how their experiences shape their political preferences, including preferences towards different policy strategies to deal with violence and crime. I have been exploring these issues in different countries affected by civil war and organized crime, including Colombia, Mexico, Brazil and Italy. 

Before joining Leiden University, I was a Lecturer at the Department of Politics and International Relations (DPIR) and an Associate Member of Nuffield College at the University of Oxford; a Postdoctoral Fellow at the Bremen International Graduate School of Social Science (BIGSSS), and a Research Fellow at the Program on Order, Conflict and Violence (OCV), Yale University. I completed my Ph.D. at the European University Institute.  

For my full CV click [ here | updated January 2023]

You can reach me at


Institute of Political Science

Leiden University
Turfmarkt 99

2511 DP The Hague
Room  6.06

+31 70 800 3879

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