A native of Ireland, Fr. Brennan was ordained in 1968 in the Society of African Missions. Fr. Brennan, who is a fluent Spanish speaker, was a missionary in Argentina from 1969 to 1979 where he taught in Cordoba in a teachers’ training college and later worked in Santiago del Estero, one of the poorest provinces of Argentina. From 1979 to 1981 he did his doctoral studies in Rome. He defended his dissertation, The Evangelization of Indians of Ancient Tucuman, 1550-1614 in June, 1981 and, it was published in 1989. Fr. Brennan served as a professor and vice-rector at St. Augustine’s Major Seminary in Nigeria. In 1990, he published Christian Mission in a Pluralistic World (Paulist Press). In 1997, his book, Christ the One Sent was published by Liturgical Press; the Spanish edition, Cristo El Enviado was published in 2000 (Ediciones Mensajero).
