Marilla North attended Newcastle Girls' High School where Dymphna Cusack had been a schoolteacher sixteen years previously. Her poetry as a young adult was regularly published in the Canberra Times.
In 1976, while working at the Film and Television School in Sydney, North met Julie James Bailey, (daughter of Florence James), who was researching the viability of turning Come In Spinner into a movie. North helped design the research study and her earlier interest in the friendship between Cusack and James became a long-term project.
An Arts graduate from the University of New England, North completed postgraduate studies in psychology, media and drama at Macquarie and Sydney Universities, conducted research studies for the ABC and the Australian Film, Television and Radio School and completed an MA (Hons) in post-colonial literature at Wollongong University. Her PhD candidature has been undertaken at the University of Queensland: the first volume of the planned biographical trilogy that was the focus of this research was published in 2017. It followed North's original hybrid narrative, Yarn Spinners: A Story in Letters -- Dymphna Cusack, Miles Franklin and Florence James, which was published in 2001 and won the FAW Biography Prize.
North is a freelance features journalist and reviewer, and teaches literature and writing skills.