 He studied economics and photography in Spain and film at the California Institute of the Arts in Los Angeles where he graduated in 1994 with honors from the School of Film and Video.From 1994 and 1999 Prieto lived in Seattle, San Francisco and Los Angeles where he worked as an editor on short films, commercials and documentaries - including the 1994 Student Academy Award Nominee "The Night Voice".In 2000, Prieto's commercial directing career began with his work for Albinana Films, in Barcelona (Spain).