Tierney joined the University of Adelaide in Australia as a professor and director of the Department of Clinical Nursing Research, and as director of the South Australian Center of the Joanna Briggs Institute at the Royal Adelaide Hospital.
Tierney wechselte an die University of Adelaide in Australien als Professorin und Leiterin der Fakultät für klinische Pflegeforschung, sowie als Leiterin des South Australian Centre of the Joanna Briggs Institute am Royal Adelaide Hospital.