Question: Cressida Dick, currently the Commissioner of Police of the Metropolis, operates as the head of what?

full_context: Document 1: Deputy assistant commissioner: Deputy assistant commissioner (DAC), formally Deputy Assistant Commissioner of Police of the Metropolis, is a rank in London's Metropolitan Police Service between assistant commissioner and commander. It is equivalent to deputy chief constable in other British police forces and wears the same insignia: a pip above crossed tipstaves within a wreath.
Document 2: Vicki Hennessy: Vicki Hennessy is the Sheriff of San Francisco and is the San Francisco's first female sheriff. She was appointed interim sheriff by Mayor Ed Lee pending an ethics investigation of the elected sheriff, Ross Mirkarimi, who was charged with domestic violence battery and later agreed to a plea bargain in which he pleaded guilty to misdemeanor false imprisonment. She is no relation to former Sheriff Mike Hennessey.
Document 3: Minister for Policing: The Minister of State for Policing, Fire and Criminal Justice is a ministerial position held jointly at the Home Office and the Ministry of Justice in the Government of the United Kingdom. Conservative MP Mike Penning held the portfolio between July 2014 and July 2016. He was promoted by new Prime Minister Theresa May in 2016, with his successor announced as Brandon Lewis. The post was created by the splitting of the now-defunct office of the Minister for Security, Counter-Terrorism, Crime and Policing into two new ministerial posts: Security & Counter-Terrorism and Crime & Policing. From January 2016 onwards the Minister is responsible for the portfolio for Fire and Rescue Services.
Document 4: Commissioner of Police of the Metropolis: The Commissioner of Police of the Metropolis is the head of London's Metropolitan Police Service. The post is currently held by Cressida Dick, who assumed office on 10 April 2017.
Document 5: John Stevens, Baron Stevens of Kirkwhelpington: John Arthur Stevens, Baron Stevens of Kirkwhelpington, (born 21 October 1942) was Commissioner of Police of the Metropolis (head of the Metropolitan Police Service) from 2000 until 2005. From 1991 to 1996, he was Chief Constable of Northumbria Police before being appointed one of HM Inspectors of Constabulary in September 1996. He was then appointed Deputy Commissioner of the Met in 1998 until his promotion to Commissioner in 2000. He was a writer for the "News of the World", for £7,000 an article, until his resignation as the hacking scandal progressed.
Document 6: Deputy Commissioner of Police of the Metropolis: The Deputy Commissioner of Police of the Metropolis, commonly referred to simply as the Deputy Commissioner, is the second-in-command of London's Metropolitan Police Service. The rank is senior to Assistant Commissioner, but junior by one rank to Commissioner. The Deputy Commissioner's salary from 1 September 2010 is £214,722, making them the second highest paid British police officer.
Document 7: Theresa Sparks: Theresa Sparks is the Executive Director of the San Francisco Human Rights Commission and was a candidate for San Francisco Supervisor for District 6 in the November 2010 election. She is a former president of the San Francisco Police Commission and former CEO of Good Vibrations. She is also one of San Francisco's most famous transgender women and was a Grand Marshal in the 2008 San Francisco Pride Parade.
Document 8: Metropolitan Police Department, City of St. Louis: The Metropolitan Police Department (SLMPD) is the principal law enforcement agency responsible for serving City of St. Louis in the U.S. state of Missouri. The department is accredited through the Commission on Accreditation for Law Enforcement Agencies (CALEA). The current Interim Commissioner of Police is Lieutenant Colonel Lawrence M. O’Toole, who was named to the position on April 19, 2017. The Metropolitan Police Department is a division of the St. Louis Department of Public Safety. Metropolitan Police Department is the second largest city police agency in Missouri, based on number of employees, city population, and geographic area served..
Document 9: Greater Manchester Police and Crime Commissioner: The Greater Manchester Police and Crime Commissioner was the police and crime commissioner, an elected official tasked with setting out the way crime is tackled by the Greater Manchester Police in Greater Manchester. The post was created on 21 November 2012, following an election held on 15 November 2012, and replaced the Greater Manchester Police Authority. Upon the creation of a Mayor of Greater Manchester and the inaugural election to that position, the duties of Greater Manchester Police and Crime Commissioner were absolved into the mayoralty and the office itself abolished. For the entirety of its existence, the commissioner was Labour Party politician Tony Lloyd. The police and crime commissioner was required to produce a strategic Greater Manchester Police and Crime Plan, setting out the priorities for the Greater Manchester Police, and their work is scrutinised by the Greater Manchester Police and Crime Panel. In November 2014 it was announced that the role would be replaced with a directly elected Mayor of Greater Manchester, and the term of office of the incumbent commissioner was extended to May 2017.
Document 10: Joseph Simpson: Sir Joseph Simpson, KBE, KPFSM (26 June 1909 – 20 March 1968), commonly known as Joe Simpson to his men, was Commissioner of Police of the Metropolis, the head of the London Metropolitan Police, from 1958 to 1968. He was the first Commissioner who began his police career as an ordinary constable.
Document 11: Home Office under Theresa May: The Home Office under Theresa May refers to the period during which British Prime Minister Theresa May served as Home Secretary. As a member of David Cameron's first government May was appointed as Home Secretary on 12 May 2010, shortly after Cameron became prime minister, and continued in the post as part of the second Cameron ministry following the 2015 general election. She held the post until she succeeded Cameron as prime minister on 13 July 2016.
Document 12: Christine Jones (police officer): Commander Christine Jones (born 1964 or 1965) is a senior British police officer serving with London's Metropolitan Police Service ("the Met"). As of 2014, she is the Met's senior officer responsible for mental health and for domestic violence; she also the leads the Association of Chief Police Officers' (ACPO) National Mental Health Working Group.
Document 13: List of Commissioners of New South Wales Police: The Commissioner of the New South Wales Police Force (Known from 1851 to 1926 as the Inspector-General of the New South Wales Police Force) is the head of New South Wales's Police Force. The post is currently held by Mick Fuller, who replaced Andrew Scipione on 31 March 2017. The rank is usually referred to as the New South Wales Police Commissioner or simply just "Commissioner". The New South Wales Police Force has had 22 Commissioners since 1851.
Document 14: Cressida Dick: Cressida Rose Dick, {'1': ", '2': ", '3': ", '4': "} (born 16 October 1960) is a British senior police officer, currently the Commissioner of the Metropolitan Police in London. She is the first woman to take charge of the service, being selected for the role in February 2017 and taking office on 10 April 2017.
Document 15: Richard Mayne: Sir Richard Mayne KCB (27 November 1796 – 26 December 1868) was a barrister and the joint first Commissioner of Police of the Metropolis, the head of the London Metropolitan Police (1829–1868). With an incumbency of 39 years, he was also the longest-serving Commissioner in the force's history, as well as the youngest on his appointment.
ground_truth: London's Metropolitan Police Service