Duncan was born in Mildura, Australia on the Murray River and grew up living mostly in country towns.
After leaving school, he eventually became a senior technical representative for Australia's leading photographic supply house.
His photograph of a bush homestead was used for the cover art of Midnight Oil's 1987 album, Diesel and Dust.
[4] At the 1988 ARIA Music Awards together with Creative Type Wart, Gary Morris, and Midnight Oil, he won for Best Cover Art.
In the 2009 Australia Day Honours, Duncan was awarded a Medal of the Order of Australia (OAM) by the Australian Government for his services to the arts as a landscape photographer and publisher, and for his service to the Central Coast community.