GroupM WPP's GroupM has named David Grabert as its new director of corporate communications, a role which will see him lead GroupM's media investment, data and technology strategy on behalf of agencies and clients. Making the move from Clear Channel Outdoor, where he led corporate communications for its Americas division, Grabert will be based in New York and report directly to Elizabeth McCune, global head of marketing, communications and business development. Publicis Former Tribal Worldwide Sydney managing director Phil Dowgierd has returned to the UK to become managing director of digital at Publicis London. Reporting into Publicis London chief executive Karen Buchanan, Dowgierd will sit on the agency's management board and has been tasked with leading integrated digital disciplines for clients.