Career
He was previously Commissioner of the Royal Solomon Islands Police Force. Marshall is a career police officer who joined the New Zealand Police in 1972, and has worked both in uniform and as a detective with the Criminal Investigation Branch. Within New Zealand, he has served as head of the Hawkes Bay Armed Offenders Squad, and Area Commander in Hastings and Auckland City.
Internationally he has been posted to the New Zealand diplomatic missions in Canberra from 1998 to 2002, and Washington, District of Columbia from 2002 to 2004, where he established a New Zealand Police liaison office for counter-terrorism.
He was then Assistant Commissioner at the Police National Headquarters in Wellington, before being seconded to the Solomon Islands in February 2007. In May 2008 he became acting Commissioner of Police in the Solomons, and was officially appointed to the position in March 2009.
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. Marshall has diplomas in Business Studies and New Zealand Policing, and is a graduate of the Federal Bureau of Investigation Academy.