Herrero is a Spanish producer, director and screenwriter. He graduated in law from the University of Madrid and afterwards in 1987, founded the production house Tornasol Films with Javier López Blanco. Since then he has produced more than a hundred titles, from documentaries for TV to feature films for distribution if movie theatres. One of his first more successful films that he produced was the comedy Guantanamera (1995), a satirical portrayal of life on Cuba. At first he directed several short feature films and his first feature film from 1988 was Al acecho. Afterwards he directed Desvío al paraíso (1994), thriller with Charles Dance. After the war drama Malena es un nombre de tango (1996), he shot Territorio Comanche (1997) in Bosnia, a war drama about three real Spanish TV reporters who followed the war in Bosnia. He continued to direct mostly dramas, which he released yearly, but they did not attract much attention from the audience or the critics.  He worked with Harvey Keitel and Saffron Burrows El misterio Galíndez (2003) about the disappearance of a Basque nationalist in New York in 1956. He directed the comedy Que parezca un accidente (2008) starring Carmen Maura and afterwards the thriller Night Runner (El corredor nocturno, 2009). He attracted more attention with the crime drama Frozen Silence (Silencio en la nieve, 2011) set in the historical framework of the WW II and tells the story about the Blue Division, which has never before been depicted on film. The division consists of Spanish volunteers who fought on the German side during the war. At the moment his last film is La playa de los ahogados (2015) that deals with a mysterious murder. His film Las siete muertes (2017) is currently in post-production.