Monsignor Fernando Ocáriz was born in Paris on October 27, 1944. He graduated from the University of Barcelona with a degree in Physical Sciences in 1966.
He received a licentiate in Theology from the Pontifical Lateran University in 1969 and a doctorate from the University of Navarre in 1971, the year he was ordained a priest. He was a professor of Fundamental Theology at the Pontifical University of the Holy Cross, and he has been a consultor for several departments of the Roman curia: the Congregation for the Doctrine of the Faith (since 1986), the Congregation for Clergy (since 2003) and the Pontifical Council for the Promotion of the New Evangelization (since 2011). He has been a member of the Pontifical Theological Academy since 1989.
He was named Vicar General of the Prelature of Opus Dei on April 23, 1994. On December 12, 2014, he was named Auxiliary Vicar.
His publications have dealt largely with theological and philosophical themes. Among his books several are available in English, including The Mystery of Jesus Christ, a textbook on Christology, and God as Father. Works in Spanish include Hijos de Dios en Cristo. Introducción a una teología de la participación sobrenatural; Amor a Dios, amor a los hombres; El marxismo: teoría y práctica de una revolución; Voltaire; Tratado sobre la tolerancia; Naturaleza, gracia y gloria. In 2013, Rafael Serrano's extensive interview with him was published under the title Sobre Dios, la Iglesia y el mundo.