One of two cardinals – along with Juan Luis Cipriani Thorne – who belong to Opus Dei, Herranz Casado is the organisation's highest-ranking member in the Church's hierarchy.
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During the Second Vatican Council (1962–1965), Herranz Casado served as an assistant of study on the commissions for discipline of clergy and the Christian people.
Julian Schnabel | Julian Lloyd Webber | Julian Cope | Académie Julian | Julian | Julian calendar | Julian Huxley | Julian Sands | Julian Barnes | Julian Alps | Julian Rachlin | Julian Lennon | Julian Byng, 1st Viscount Byng of Vimy | Julian Przyboś | Julian Lage | Julian Casablancas | Julian Fellowes | Julian Bond | Julian Assange | Julian Glover | Julian Sprung | Julian Peddle | Julian Opie | Julian Fantino | Julian Argüelles | William Alexander Julian | Julian Wood | Julian Symons | Julian Rignall | Julian Pettifer |
In the same ceremony, three other future cardinals were also consecrated: Jean-Louis Tauran, Vinko Puljić and Julián Herranz Casado.
He is a member of the prominent conservative Peruvian Thorne family, and one of two cardinals who are members of Opus Dei, the other being Julián Herranz Casado.