Preston, who left his role at Kasbersky Lab where he was vice-president of marketing for Europe in June, will focus on developing a sector-specific business strategy for WRG.
Preston said of his appointment: "Insight and experience are at the heart of what WRG are about, so I’m delighted to be able to add mine to their growing global network."
Head of London, WRG, Kath Goodson, added: "Both parties are excited by the potential to leverage David’s 20 years of global experience. His career to date has spanned the event marketing industry across both client and agency side.
"He’s worked across the UK, USA, France Japan, China, Singapore and Australia, most recently as VP of Marketing, Europe, for internet security company, Kaspersky Lab.
"The sheer breadth of knowledge he offers brings many possibilities for future growth to the table."