Queen Mary, University of London (informally Queen Mary, QMUL or simply QM) is a public research university located in London, United Kingdom and a constituent college of the federal University of London. With roots dating back to 1785, Queen Mary was formed by the merger of four historic colleges, and since joining the University of London in 1915 has grown to become one of its largest colleges. Queen Mary's main campus is in the Mile End area of the East End of London, with other campuses located in Holborn, Smithfield and Whitechapel. It has around 16,000 full-time students and 3,000 staff and had a total income of £289.8 million in 2009/10, of which £68.5 million was from research grants and contracts. Queen Mary is organised into three faculties - the Faculty of Humanities and Social Sciences, the Faculty of Science and Engineering and the Barts and The London School of Medicine and Dentistry - within which there are 21 academic departments and institutes. In the 2008 Research Assessment Exercise, Queen Mary was ranked 11th by the The Guardian and 13th by Times Higher Education out of the 132 UK higher education institutions assessed.