A principal lecturer at Liverpool John Moores University’s Law School researching and teaching terrorism and policing up to 2007 David was a police officer where most of his service was in Special Branch's Counter-Terrorism Unit. Up to his retirement from the police he investigated the activities of the Provisional IRA during the Irish Troubles as well as jihadist groups like Al Qaeda. In addition to his academic writing that he has published, David likes to use fiction as a vehicle to give that inside view of what it is really like to investigate terrorist activity. Born and raised in Liverpool, David still lives there with his wife Kathy and his son, Patrick. When he is not involved in his academic work or his writing, he is an avid supporter of Everton Football Club where he and his son have a season ticket. David also likes to periodically get out into the countryside with his wife and recharge the batteries.