University College, commonly known as Castle, is a college of the University of Durham in England. Centred around Durham Castle on Palace Green, it was founded in 1832 and is the oldest and therefore sometimes considered the most prestigious of Durham's colleges. As with all of Durham's colleges, it is, independently of the University, a listed body under section 216 of the Education Reform Act 1988. Almost all academic activities, such as research and tutoring, occur at a university level. University College moved into its current location in 1837. Around 150 students are accommodated within Durham Castle itself. Other halls of residence, dating from the 1950s and 1970s, are within five minutes' walk of the Castle. It has 600 undergraduates and is currently the most over-subscribed college of the University . In 1987 it was changed from an all male college to a mixed gender college. Since 1998 its Master has been geologist Professor Maurice Tucker.