Oristrell is a screenwriter, director and producer. He studied philosophy and literature, and began his film career in the 1970’s as a screenwriter for feature films and TV series. He made his directing debut in mid-1990’s when he directed a TV series and his first feature film was the comedy ¿De qué se ríen las mujeres? (1997). He continued to direct TV series and some of his feature films include the comedy Novios (1999), No Shame (Sin vergüenza, 2001) and the romantic comedy Unconscious (Inconscientes, 2004), which was his biggest success to date.  He remains faithful to the comedy genre and directed also the comedies Va a ser que nadie es perfecto (2006), Dieta mediterránea (2009) and Hablar (2015).