After studying drawing and design at East Sydney Technical College from 1960-62, Stacey worked as a graphic designer and photographer in Sydney and London from 1963-66.
In the late 1960s he worked as a magazine photographer based in Sydney; from 1969-75 he freelanced as a commercial photographer, and in the mid-seventies he travelled around Australia in a camper-van.
With David Moore and others, Stacey helped establish the Australian Centre for Photography in 1973-4.
He often used a Kodak Instamatic camera during the seventies, making series of informal images of his friends and recording his environment.
Since the early 1980s, he has employed a panoramic format to produce photographs which explore the symbolism of the natural environment and the sacred links of the Aborigines with the land.
His work was included in !Eureka! Artists from Australia at the Serpentine Gallery, London in 1982 and Australian Perspecta at the Art Gallery of New South Wales in 1983.
A retrospective of his work was held at the National Gallery of Australia in 1991.
In 1992 he was awarded one of the newly established Australia Council Creative Arts Fellowships.
His exhibition Signing the Land (1990, published in book form in 1993), juxtaposes images of inscriptions and graffiti photographed in Italy with recordings of Aboriginal and European markings on the Australian landscape to suggest a cultural commonality among peoples.
Wesley continues to travel the country, working from a base on the south coast of New South Wales.