he was the deputy commissioner of police of the metropolis for special operations and concurrent chairperson of the national police chiefs' council counter-terrorism co-ordinating committee and national director of counter terrorism policy. he was previously chief constable of surrey police (2009-2011), and was also interim deputy chief constable of the metropolitan police between february 2017 and april 2017. he retired from the police in march 2018. in july 2022 , it was announced that he was returning to policing as the city's police commissioner, replacing former commissioner dame cressida dick. he was right in as commissioner on 12 september 2022.