Andrea Varsori is Senior Lecturer at the University of Huddersfield, UK. His research focuses on urban violence, and particularly on the resilience and adaptability of urban armed groups, as well as on their strategic use of violence and its trends. Since 2019, he is Co-Coordinator of the Urban Violence Research Network. His work has been published in Small Wars and Insurgencies, Terrorism and Political Violence, and Small Wars Journal. He holds a PhD in War Studies from King’s College London.

• Chapter 1: A matter of survival the puzzle of urban armed group resilience.- Chapter 2: Criminal Adaptation An Evolutionary Framework for the Study of Urban Armed Groups.- Chapter 3: Divided Attention Rios Criminal Groups between Prisons and Favelas.- Chapter 4: Weaving ties and cutting threads an ecology of hostility and corruption in Rio de Janeiro.- Chapter 5: Beheading the headless The continued resilience of Rios violent groups.

Andrea Varsori is Senior Lecturer at the University of Huddersfield, UK. His research focuses on urban violence, and particularly on the resilience and adaptability of urban armed groups, as well as on their strategic use of violence and its trends. Since 2019, he is Co-Coordinator of the Urban Violence Research Network. His work has been published in Small Wars and Insurgencies, Terrorism and Political Violence, and Small Wars Journal. He holds a PhD in War Studies from King’s College London.

• Chapter 1: A matter of survival the puzzle of urban armed group resilience.- Chapter 2: Criminal Adaptation An Evolutionary Framework for the Study of Urban Armed Groups.- Chapter 3: Divided Attention Rios Criminal Groups between Prisons and Favelas.- Chapter 4: Weaving ties and cutting threads an ecology of hostility and corruption in Rio de Janeiro.- Chapter 5: Beheading the headless The continued resilience of Rios violent groups.