He was head of the Chair of Fundamental Theology, one of the editors of the magazine “Bogoslovska smotra” (Theogian's Review), member of the editorial boards and associate of many Croatian and foreign theology magazines and member of the Croatian Literary Translators’ Association.
The area of his special interest is the research of men's existential-spiritual dimension, in which he was discovering new possibilities and ways of modern evangelisation and the need of developing spiritual medicine, which - next to somatic and psychiatric medicine - is indispensable in the holistic healing of man, and especially in healing spiritual illnesses and addictions.
Apart from working at the Faculty, since 1971 Tomislav was also a religious teacher for students in Zagreb, the initiator of the prayer movement in the Church in Croatia, founder of the religious community “Prayer and Word” (Zajednica “Molitva i Riječ”) and the “Centre for a Better World”, as well as lecturer at numerous seminars for the spiritual renewal in Croatia and abroad.
In the last decade he has been training persons to work in centres for spiritual help and hold seminars for the apostolate of evangelisation in Croatia and abroad.
Ivančić was the author and host of a very popular Catholic radio program “Lord, teach us to pray” which is broadcast during the academic year.