Jaime Juez Castellà, who published under the names Xirinius and Jaime Juez, had his first work published in El Cino magazine when he was only fifteen years old. A couple of years later, he was present at En Patufet and L'Esquella de la Torratxa. He wanted to take on the same political comment and humor as his admired artist Joan Junceda. To avoid being confused with Junceda, he used the pseudonym Xirinius. From 1924 to 1939 he worked mainly for the publisher Innocenci López Bernagossi, being published in among others Papitu, Lecturas, Mickey and Pocholo.

Joyas Literarias Juveniles #211 - Los 500 millones de la Princesa India

He joined the Sindicat de Dibuixants Professionals, but due to the Civil War he had to leave it again. After a period of silence during the Civil War and World War II, he began drawing again, this time for the Biblioteca Oro collection of Molino publishers. He returned to comics with an adaptation of 'Cumbres Borrascosas', in which he also broke with his Junceda influenced style. He drew several adventure, sport and piracy comics for oblong books. He also drew several issues of Bruguera's Historias collection and collaborated with Darnis on 'El Jabato'.

From 1965, he began working mainly for foreign publishers, like the French Imperia, for which he illustrated 'Oliver'. He also took over the Brocal Remohi creation 'Ögan' from Buylla. After a very versatile foreign period, Juez returned to Spain in the late 1970s, where he joined Josep Toutain's Selecciones Ilustradas agency.