Rowley joined the MPS as an Assistant Commissioner in December 2011. He was awarded the Queen’s Police Medal in the same year.
Rowley was due to speak at the launch of the Henry Jackson Society report '"Islamist Terrorism: Analysis of Offences and Attacks in the UK' in March 2017, but did not ultimately attend. Middle East Eye subsequently reported that Rowley had met with Hannah Stuart and Katie Parret of HJS the previous month, but withdrew from the event after it was confirmed that Alan Mendoza and Douglas Murray would be present.
Rowley announced his retirement from this position in January 2018.
In February 2018, he gave the Colin Cramphorn Memorial Lecture at Policy Exchange. His speech criticised 'so-called representative bodies' which he said 'speak out in such a way to create and exploit grievances and isolation, by: being equivocal in condemning acts of terrorism; undermining efforts to safeguard the young and vulnerable from radicalisation, and spreading disinformation about national security and foreign policy.
- Mark Rowley, RUS, accessed 4 March 2018.
- Simon Hooper, Alex McDonald, Police chief snubs 'Islamist terrorism' event after criticism, Middle East Eye, 2 March 2018.
- Simon Hooper, EXCLUSIVE: How police counter-terror chief was courted by 'Islamophobic' think tank, Middle East Eye, 2 March 2018.
- Harry Cockburn, Mark Rowley resigns: Met Police's head of counter-terrorism steps down, Independent, 9 January 2018.
- Extremism and Terrorism: The need for a whole society response, Policy Exchange, 26 February 2018.