Landscape architect William Mount (commonly known as 'Bil') was born in Kent, to a family of fruit farmers. Bil Mount studied under Clifford Tandy, taking an external masters degree in landscape architecture at University College London in 1968. He became a Fellow of the Institute of Landscape Architects in 1977.
He was landscape architect to Somerset County Council from 1962 to 1974, where he helped to instigate the restoration of the formal gardens designed by Edwin Lutyens and Gertrude Jekyll at Hestercombe.
As chief landscape architect at East Sussex County Council from 1975 to 1987, Bil Mount worked closely with an American benefactor, John McCarthy, to restore many of the county's historic gardens through the Historic Gardens Trust (Sussex) which they founded together in 1980.
He was in private practice from 1987, retiring in 1992.