Google Alan Moss is spearheading Amazon's push to steal ad dollars from Facebook and Google. The Amazon VP of worldwide ad sales is a former Google exec who helped grow the search giant's ad business. Moss is tasked with selling to non-endemic marketers, but convincing them to spend on Amazon is a challenge. Shortly after starting last year as one of Amazon's top advertising executives, Alan Moss set up meetings with chief marketing officers of big brands like automakers that don't sell their products on Amazon. These meetings are crucial to Amazon and signaled an evolution in its messaging. Amazon Advertising has been an easy sell to the performance marketers who typically used its platform to drive sales, but convincing non-endemic marketers has been a new challenge.