Simpson spent twelve years as an investigative journalist for the Sydney Morning Herald before joining the staff of the Journalism and Media Studies department at the University of Tasmania.
A writer across genres, Simpson has published several works of non-fiction including Brothers in Arms (1989, reprinted 2001), The Killer Next Door (1994), My Husband My Killer (1992, reprinted 2001), all with Sandra Harvey; More than One (1994) with Andiee Paviour; The Australian Geographic Book of Tasmania (1997) and To Have and to Hold (1997) with Walter Mikac. Her first novel, with a working title 'An Evolutionary Tale' was completed in 2004; it deals with Darwinian themes and looks at life in Van Diemen's land in the years 1830-1850 through the eyes of three different characters - a Commandant, a storekeeper and a Governor's wife.