Grayling, which has run marketing campaigns linked to the London 2012 Olympics and the World Cup, will use Hamilton’s appointment to develop a dedicated sports practice.
Alison Clarke, Grayling’s chief executive in the UK and Ireland, said: "Our credentials in sports marketing currently run across a wide range of sectors, sports and events. Nick’s appointment will ensure we can provide clients with the latest insights into sports sponsorship, event promotions and stakeholder and ambassador engagement."
Grayling said Hamilton, who took up his role at the start of August, brought with him "extensive experience" in sports marketing.
Before joining Grayling, Hamilton was account director of sport at Weber Shandwick for more than two years. Prior to that he was an account director at M&C Saatchi Sport & Entertainment for almost three years.
Hamilton’s other experience includes stints at Freud Communications and Threepipe.
Hamilton said: "Our new sports practice will bring the Grayling data-driven approach to sports marketers and we look forward to launching new products later this year that will be integral to our unique approach."