This firm helps get the word out about all the colored little pills. Grey Healthcare Group is a leading advertising and marketing business focused on serving the pharmaceutical and health care industries. Through more than 40 offices spanning 20 countries around the globe, it operates through several subsidiary agencies, including GHG Advertising, Nova Grey, Newton Grey, Phase Five Communications (medical education and meeting management), Avenue Grey (direct-to-patient marketing), Insight Medical Communications, and OnCall (contract sales). Grey Healthcare is a unit of Grey Group, which itself is a division of UK-based communications services giant WPP Group.