Hill Holliday is a marketing and communications agency based in Boston, Massachusetts with offices in New York City and Greenville, South Carolina. It is the 17th largest advertising agency in the U.S. and is part of the world's third largest advertising and marketing conglomerate, IPG. Karen Kaplan serves as Chairman and CEO of the agency, having worked there since 1982 when she was hired as a receptionist. She has been named one of the "100 Most Influential Women in Advertising" by Advertising Age.