Mike Nash was previously Head of Department and Professor of Criminology at the SSCJ, University of Portsmouth. As a former senior probation officer, he has worked in prisons, as well as on the early development of what were to become the multi-agency public protection arrangements (MAPPA).

Andy Williams is Principal Lecturer in Criminology and Criminal Justice at SCCJ, University of Portsmouth. He has developed academic courses and practitioner training in understanding risk and dangerousness for violent and sexual offenders and has undertaken numerous evaluations of public protection systems.