After one year lecturing at the PISAI, he was appointed lecturer in the Department of Religious Studies at the University of Makerere, Kampala, Uganda, where he taught courses on Islam to Muslim as well as to Christian students. In 1971 he returned to Rome to pursue his teaching and scholarly interests at the PISAI. From 1972 to 1978 he was Director of the PISAI. During this period Fitzgerald was involved in the creation of "Encounter, Documents for Christian-Muslim Understanding", a periodical publication on Islam, and supervised the launch of "Islamochristiana", a scholarly journal specialised in Christian-Muslim relations and interreligious dialogue. In 1972 he became consultor of the Pontifical Council for Interreligious Dialogue, then known as Secretariat for Non-Christians.