While living in Canada, she completed a master's degree in Political Theory at the University of Toronto.In 1980–81 Geason wrote a number of articles on education for The National Times.
From March 1982 to January 1989 Geason worked in the NSW Premier's Department.In the early 1990s Geason was literary editor for The Sydney Morning Herald.
The State Library of New South Wales holds the Susan Geason papers, 1989-2001, relating to the books she was writing at that time and comprising correspondence, draft manuscripts, interview notes, book plans, news clippings, research and photographs.Geason was awarded a PhD in Creative Writing by the School of English, Media Studies and Art History at the University of Queensland in 2005 for her thesis, "Under the Canopy of Heaven : Charlotte Brontë and Mary Taylor; What Mary Knew : The Relationship Between Mary Taylor and Charlotte Brontë".
It was published as What Mary Knew : Mary Taylor and Charlotte Brontë in 2011.