Within New Zealand, he has served as head of the Hawkes Bay Armed Offenders Squad, and Area Commander in Hastings and Auckland City.

[4] He was then Assistant Commissioner at the Police National Headquarters in Wellington, before being seconded to the Solomon Islands in February 2007.

While in the Solomons he was subjected to a home invasion by a group of thirteen people armed with machetes, but was able to defend himself and his wife with a steel ceremonial sword.

[6] In April 2011, Marshall became the Commissioner of the New Zealand Police, and announced he would put a taser in every frontline vehicle, but would not be changing the policy that officers do not ordinarily carry firearms.

[7] Marshall has diplomas in Business Studies and New Zealand Policing, and is a graduate of the FBI Academy.