Fagan joins the Aegis digital performance agency to take responsibility for its search billings, worth more than £100 million. He becomes a member of the iProspect executive management team, reporting to its managing director, Ben Wood.
Fagan joined the independent communications agency Golley Slater in 2006, overseeing its search and media divisions and building digital strategy for clients including Center Parcs and Crocs.
He has just finished his two-year tenure as chairman of the IPA Search Group, where he launched the IPA search certificate for member agencies.
Wood said: "We are excited about the experience Mark will bring to the team in terms of search leadership, integrated performance, client services and strategy."