PhD from the Complutense University of Madrid and lecturer in Ancient and Medieval Philosophy at the Universidad de Zaragoza. The author of Contra la postmodernidad (2011), Un palo al agua: Ensayos de estética (2016), El trap: Filosofia millennial para la crisis en España (2019), Ética, estética y política (2020) and Realismo poscolonial: Ontología y Epistemologia para el siglo XXI (2020), Castro shares his classes and lectures on his YouTube channel. Described as a polemicist and provocateur, he is interested in questions of aesthetics, cultural studies and the theory of image applied especially to films, poetry and contemporary art.

He works as a critic at Quimera and has contributed to media publications such as Revista de Occidente and Cuadernos de Iván. He was the coordinator of Bizarro (2010) and El arte de la indignación (2012) and a contributor to Tenían veinte años y estaban locos (2011), Humanismo-animalismo (2012) and Indignación y rebeldía (2013).