GroupM named David Grabert as global director of corporate communications. He will lead strategic external and internal communications to support GroupM's worldwide leadership in media investment,
data and technology on behalf of the company's agencies and clients. Based in New York, Grabert will report to Elizabeth McCune, global head of marketing, communications and business development.
Grabert joins GroupM from Clear Channel Outdoor, a subsidiary of iHeartMedia, Inc., where he led corporate communications for the company's Americas division. Prior to that, he held senior
communications and marketing roles at Cox Communications, Comcast and Canoe Ventures.