Maria Wallis QPM (born 13 August 1955)[1] was the Chief Constable of the Devon and Cornwall Constabulary in the United Kingdom from 2002 until 26 July 2006. A native of County Fermanagh, she commanded the Devon and Cornwall Constabulary which included responsibility for 3,500 police officers, more than 2,000 civilian staff and 362 police community support officers. Chief Constable Wallis commanded the largest geographical police area in England, extending 180 miles from the Dorset and Somerset borders in the east to the Isles of Scilly in the west.