He was the Liberal member for Monaro in the New South Wales Legislative Assembly from 1965 to 1976, and was Minister for Youth, Ethnic and Community Affairs from 1975 to 1976.
Mauger was born in Williamstown in Victoria to Albert Stephen Bamford, an electrical engineer in the fire brigade, and Matilda May Walker.
The family moved to Canberra in 1926, and Mauger attended public schools in Telopea Park.
He served in the Citizen Military Forces from 1936 until 1940, when he enlisted in the RAAF; in 1945 he retired as a sergeant.
[2] He held the seat with safer margins in subsequent elections, and in 1975 was made Minister for Youth, Ethnic and Community Affairs.