Peter Gill is Honorary Visiting Research Fellow at the University of Leicester, UK. He has written Policing Politics: Security Intelligence and the Liberal Democratic State (1994), Rounding Up the Usual Suspects?: Developments in Contemporary Law Enforcement Intelligence (2000), and Intelligence Governance and Democratisation: A comparative analysis of the limits of reform (2016). He has also co-authored Intelligence in an Insecure World (with Mark Phythian, 3rd ed. 2018) and Democratization of Intelligence (with Michael M. Andregg, 2015).

Stephen Marrin is an Associate Professor at James Madison University, UK, and previously worked as an analyst with the CIA and the Government Accountability Office (USA). He is a prolific author on aspects of intelligence analysis, and a former Chair of the Intelligence Studies Section of the International Studies Association. In 2004 the National Journal profiled him as one of the ten leading experts on the subject of intelligence reform.

Mark Phythian is Professor of Politics in the School of History, Politics & International Relations at the University of Leicester, UK. He has both authored and edited several books on aspects of intelligence, including co-authoring Intelligence in an Insecure World (with Peter Gill, 3rd ed. 2018). He is co-editor of the journal Intelligence and National Security, and a Fellow of the Academy of Social Sciences.