Seddon held AM; BA (Hons); MSc; PhD, University of Minnesota; Hon DLit, University of Western Australia; Hon FAILA; Hon FRAPI; FTS.

Seddon studied English at the University of Melbourne, and later received an MSc and a PhD in Geology at the University of Minnesota. He held the Chair of History and Philosophy of Science at the University of NSW and later became Director of the Centre for Environmental Studies and the Dean of Architecture and Planning at Melbourne University. Across five decades he held Chairs in four different disciplines (English, UWA; Geology, Oregon; History and Philosophy of Science, UNSW; Environmental Science, Melbourne) and taught at universities in Lisbon, Toronto, Bologna, Rome, Venice, Minnesota and Oregon.

Seddon published 217 papers and numerous books, many of which have won awards. These awards include three Robin Boyd Environmental Awards, the Eureka Prize from the Australian Museum in 1995, for the Snowy book, and the Mawson Medal from the Academy of Science, in 1996.

He was an Honorary Fellow of both the Royal Australian Planning Institute and the Australian Institute of Landscape Architects; Fellow of the Australian Academy of Technological Sciences and Engineering; and an Honorary Fellow of the Australian Academy of the Humanities. In 1998 he became a Member of the Order of Australia; in 2000 he was made an Honorary Doctor of Literae Humaniores by the University of Western Australia, and in December, a Festschrift was organised jointly by ANU, La Trobe, Murdoch and UWA universities, with delegates from other institutions. He was made citizen of the Year in Fremantle for 2001.

Seddon died in his Fremantle home on 9 May 2007. He had a son, Jack and a daughter Polly.

Books

• Swan River Landscapes (Perth: University of Western Australia Press. 1970)
• Sense of Place (Perth: University of Western Australia Press, 1972)
• Man and landscape in Australia: towards an ecological vision (Aust. UNESCO Committee for Man and the Biosphere, pub No. 2, Canberra: Australian Government Publishing Service, 1976)
• A City and Its Setting: Images of Perth. (Fremantle: Fremantle Arts Centre Press, 1987)
• Searching for the Snowy: an Environmental History. (St Leonards, Sydney: Allen and Unwin, 1994)
• Swan Song: reflections on Perth and Western Australia 1956 -1995 (Centre for Studies in Australian Literature: University of Western Australia, 1995)
• Landprints: Reflections on Place and Landscape (Cambridge: Cambridge University Press, 1997)
• Looking at an Old Suburb: A Walking Guide to Four Blocks of Fremantle with Barbara Haddy (Fremantle Arts Centre Press, 2000)
• The Old Country: Australian Landscapes, Plants and People (Cambridge University Press, 2005)

Articles

• "The Australian Back Yard" in Australian Popular Culture ed. Ian Craven. (Cambridge: Cambridge University Press, 1994)
• "Return to Portugal" in Best Essays of 1998, edited by Peter Craven (Melbourne: Bookman Press, 1998)
• "Imagining the West" in Imagining Australia, ed. Silvia Albertazzi, Sheila M. Downing, Monica Turci. (Rome: Vecchiarelli Editore, 1998)
• "Land and Language" in Meanjin (Issue 58:2, pp 140-152, 1999)
• "Saving the Throwaway River" in Australian Geograhical Studies (Issue 37:3, pp 314-321, 1999)
• "Alien Invaders" in The Mediterranean Garden (Issue 18: pp 42-45, 1999)
• "The Mediterranean Garden in Australia" in The Mediterranean Garden (Issue 17: pp 18-26, 1999)