Born in Barcelona in 1978. He graduated in Cinematography at ESCAC (The Cinema and Audiovisual School of Catalonia) in 2001 and completed his academic education with a two-year masters degree at the National Polish Film School in Lodz that somehow determined the course of his career.
Arnau has worked as Director of Photography on about twenty films to date. His work has always been met with praise and recognition, including prizes for Best Cinematography at the Rome Film Festival for Mai Morire (Dir. Enrique Rivero), Best Cinematography at the Gaudi Awards for Eva, and Goya Awards nominations for Eva and The Fury of a Patient Man.