Siglo XXI de España Editores was born in 1967, in the wake of Arnaldo Orfila Reynal, with a clear intellectual and practical vocation in the circumstances of the moment. Its priority was and is twofold: on the one hand, to spread knowledge, thought and elements of criticism, and, on the other, to facilitate their social or academic debate. This editorial perspective then made its way into a non-democratic society, which is why the pillars of its evolution, innovative and risky but still valid, are simply the respect and development of the right to freedom of expression, rigor in the quality of editions accessible to all budgets and the systematic demand for rigorous work and research. Defender of both the most entrenched progressive thinking and isolated and essential individual visions in democracy, Siglo XXI de España Editores has an extensive and notable catalog in the field of human and social sciences, whose titles reveal by themselves the valuable heritage political, economic and social that he has published, and that he has managed to transmit for four decades in the Spanish-speaking world.