ZenithOptimedia Group has appointed Tim Collison to the newly created position of global communications director, effective Feb. 25. Collison is tasked with oversight of the agency network’s internal and external marketing and communications. Previously, Collison was director of worldwide communications for Interpublic Group’s Initiative; before that he was marketing partner for the Europe, Middle East and Africa region at WPP’s Mediaedge:cia. Earlier, Collison was in the publishing business, including a stint as editor and publisher of Media & Marketing. At his new post, he will report to Belinda Rowe, global managing partner for ZenithOptimedia Worldwide.