Operating as a business unit, phd USA is a part of PHD, which is a media and communications agency with more than 55 offices throughout the world. Formed in 1990, the parent company has a staff of over 2,000 professionals. It is a part of the Omnicom Media Group, which also operates the OMD and Prometheus media networks. The Omnicom Media Group is a media services division of the Omnicom Group,...