Monsignor Luigi Giussani (1922-2005) was the founder of the Catholic lay movement Communion and Liberation in Italy. His works are available in over twenty languages and include the trilogy The Religious Sense, At the Origin of the Christian Claim, and Why the Church?, as well as the three volumes of Is It Possible to Live This Way?

Stefano Alberto (Biella 1959-) is a priest belonging to the Fraternity of Saint Charles Borromeo, Rome. He teaches Introduction to Theology at the Catholic University in Milan.

Javier Prades (Madrid 1960-) is a priest from the Diocese of Madrid. He is full professor in sistematic theology & dean of the Theological Faculty "San Dámaso", Madrid.