
Roberts will lead the agency's creative output and mentor the creative teams.
Roberts left Euro RSCG London in March 2009 and went freelance, before joining Crayon this month.
Richard French, managing director at Crayon, said of the appointment: "Adam's experience, insight and fresh thinking will be a great asset to the agency and our clients.
"Adam is one of those rare digital creatives who truly understands the power of big ideas and knows how to make them thrive across digital channels."