Doubleclick is a subsidiary of google which develops and provides internet ad serving services. its clients include agencies, marketers (universal mccann interactive, akqa etc. ) and publishers who serve customers like microsoft, general motors, coca-cola, motorola, l'oréal, palm, inc. , apple inc. , visa usa, nike, carlsberg among others. doubleclick's headquarters is in new york city, united states. doubleclick was founded in 1995 by kevin o'connor and dwight merriman.