Juan Masullo J.

Political Scientist

(and passionate rock climber)

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



I am an Assistant Professor at the Institute of Political Science, Leiden University. I'm also a Research Associate at the Changing Character of War Centre, University of Oxford, and co-editor (2021 - ) of Qualitative & Multi-Method Research, the biannual publication of APSA’s Qualitative and Multi-Method Research Section.

My research combines multiple types of methods and evidence, often involving extensive fieldwork, to study social processes of political and criminal violence. I'm particularly intrigued by the decision-making processes underlying the behavior of individuals and communities living in the midst of armed conflict and the drivers of peoples' preferences and attitudes 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, and Brazil. 

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 Sept 2020]

You can reach me at



Institute of Political Science

Leiden University
Turfmarkt 99

2511 DP The Hague
Room  6.06

+31 70 800 3879