In 1979, he began to teach in the TAI School of Madrid, working with playwrights such as Adolfo Marsillach on Peter Weiss' Marat/Sade, which won the Premio Especial Ciclo del Teatro Latino, and Las arrecogías del beaterio de Santa María Egipciaca by José Martín Remember.
His performing work alternated with the publication of articles and reviews theater in numerous newspapers and magazines.
Miralles was one of the essential names of independent theater in the 1960s, and one of the founders of the Spanish Association of Playwrights, of which he later became president.
Miralles is the author of numerous scholarly articles on theater published in national newspapers and magazines of the trade.
He published the novels Una semana pintada de negro, which won the Maritime University Prize, and Mi país es tu piel.