Tacey has specialised in the analytical psychology of C. G. Jung and for twenty years at La Trobe he co-taught, with philosopher Robert Farrell, on "Jung's cultural psychology". In this field he published "Jung and the New Age; The Idea of the Numinous: Contemporary Jungian and Psychoanalytic Perspectives" (with Ann Casement); "Gods and Diseases: Making Sense of our Physical and Mental Wellbeing"; "How to Read Jung" and "The Darkening Spirit: Jung, Spirituality, Religion". In 2012 he edited the scholarly volume "The Jung Reader" for Routledge. During his last six years at La Trobe, he co-taught, with sociologist John Carroll, "The Crisis of Meaning in the 21st Century".